diff --git a/pandas/core/generic.py b/pandas/core/generic.py
index 36c0d024369e6..8916c1688344b 100644
--- a/pandas/core/generic.py
+++ b/pandas/core/generic.py
@@ -4816,7 +4816,6 @@ def reindex(self: FrameOrSeries, *args, **kwargs) -> FrameOrSeries:
             axes, level, limit, tolerance, method, fill_value, copy
         ).__finalize__(self, method="reindex")
 
-    @final
     def _reindex_axes(
         self: FrameOrSeries, axes, level, limit, tolerance, method, fill_value, copy
     ) -> FrameOrSeries:
@@ -8977,7 +8976,6 @@ def where(
 
         return self._where(cond, other, inplace, axis, level, errors=errors)
 
-    @final
     @doc(
         where,
         klass=_shared_doc_kwargs["klass"],
diff --git a/pandas/core/groupby/groupby.py b/pandas/core/groupby/groupby.py
index ab29dea3190c8..b1f3ddcfac069 100644
--- a/pandas/core/groupby/groupby.py
+++ b/pandas/core/groupby/groupby.py
@@ -1960,7 +1960,6 @@ def ohlc(self) -> DataFrame:
             lambda x: x.ohlc(), self._obj_with_exclusions
         )
 
-    @final
     @doc(DataFrame.describe)
     def describe(self, **kwargs):
         with group_selection_context(self):
@@ -3093,7 +3092,6 @@ def shift(self, periods=1, freq=None, axis=0, fill_value=None):
         )
         return res
 
-    @final
     @Substitution(name="groupby")
     @Appender(_common_see_also)
     def pct_change(self, periods=1, fill_method="pad", limit=None, freq=None, axis=0):
diff --git a/pandas/core/internals/managers.py b/pandas/core/internals/managers.py
index d0dad26cfb275..3bbfda5edc04f 100644
--- a/pandas/core/internals/managers.py
+++ b/pandas/core/internals/managers.py
@@ -1859,7 +1859,7 @@ def construction_error(
 # -----------------------------------------------------------------------
 
 
-def _grouping_func(tup):
+def _grouping_func(tup: tuple[int, ArrayLike]) -> tuple[bool, DtypeObj]:
     # compat for numpy<1.21, in which comparing a np.dtype with an ExtensionDtype
     # raises instead of returning False. Once earlier numpy versions are dropped,
     # this can be simplified to `return tup[1].dtype`
diff --git a/pandas/tests/generic/test_series.py b/pandas/tests/generic/test_series.py
index 6e5cb3add43df..b733957cb9170 100644
--- a/pandas/tests/generic/test_series.py
+++ b/pandas/tests/generic/test_series.py
@@ -19,38 +19,38 @@ class TestSeries(Generic):
 
     @pytest.mark.parametrize("func", ["rename_axis", "_set_axis_name"])
     def test_set_axis_name_mi(self, func):
-        s = Series(
+        ser = Series(
             [11, 21, 31],
             index=MultiIndex.from_tuples(
                 [("A", x) for x in ["a", "B", "c"]], names=["l1", "l2"]
             ),
         )
 
-        result = methodcaller(func, ["L1", "L2"])(s)
-        assert s.index.name is None
-        assert s.index.names == ["l1", "l2"]
+        result = methodcaller(func, ["L1", "L2"])(ser)
+        assert ser.index.name is None
+        assert ser.index.names == ["l1", "l2"]
         assert result.index.name is None
         assert result.index.names, ["L1", "L2"]
 
     def test_set_axis_name_raises(self):
-        s = Series([1])
+        ser = Series([1])
         msg = "No axis named 1 for object type Series"
         with pytest.raises(ValueError, match=msg):
-            s._set_axis_name(name="a", axis=1)
+            ser._set_axis_name(name="a", axis=1)
 
     def test_get_bool_data_preserve_dtype(self):
-        o = Series([True, False, True])
-        result = o._get_bool_data()
-        self._compare(result, o)
+        ser = Series([True, False, True])
+        result = ser._get_bool_data()
+        self._compare(result, ser)
 
     def test_nonzero_single_element(self):
 
         # allow single item via bool method
-        s = Series([True])
-        assert s.bool()
+        ser = Series([True])
+        assert ser.bool()
 
-        s = Series([False])
-        assert not s.bool()
+        ser = Series([False])
+        assert not ser.bool()
 
     @pytest.mark.parametrize("data", [np.nan, pd.NaT, True, False])
     def test_nonzero_single_element_raise_1(self, data):
@@ -112,25 +112,29 @@ def test_metadata_propagation_indiv_resample(self):
     def test_metadata_propagation_indiv(self):
         # check that the metadata matches up on the resulting ops
 
-        o = Series(range(3), range(3))
-        o.name = "foo"
-        o2 = Series(range(3), range(3))
-        o2.name = "bar"
+        ser = Series(range(3), range(3))
+        ser.name = "foo"
+        ser2 = Series(range(3), range(3))
+        ser2.name = "bar"
 
-        result = o.T
-        self.check_metadata(o, result)
+        result = ser.T
+        self.check_metadata(ser, result)
 
         _metadata = Series._metadata
         _finalize = Series.__finalize__
         Series._metadata = ["name", "filename"]
-        o.filename = "foo"
-        o2.filename = "bar"
+        ser.filename = "foo"
+        ser2.filename = "bar"
 
         def finalize(self, other, method=None, **kwargs):
             for name in self._metadata:
                 if method == "concat" and name == "filename":
                     value = "+".join(
-                        [getattr(o, name) for o in other.objs if getattr(o, name, None)]
+                        [
+                            getattr(obj, name)
+                            for obj in other.objs
+                            if getattr(obj, name, None)
+                        ]
                     )
                     object.__setattr__(self, name, value)
                 else:
@@ -140,7 +144,7 @@ def finalize(self, other, method=None, **kwargs):
 
         Series.__finalize__ = finalize
 
-        result = pd.concat([o, o2])
+        result = pd.concat([ser, ser2])
         assert result.filename == "foo+bar"
         assert result.name is None