diff --git a/pylint/checkers/typecheck.py b/pylint/checkers/typecheck.py
index 360676b6e5..3291393a43 100644
--- a/pylint/checkers/typecheck.py
+++ b/pylint/checkers/typecheck.py
@@ -1510,7 +1510,6 @@ def _check_invalid_sequence_index(self, subscript: astroid.Subscript):
                 return None
             itemmethod = methods[0]
         except (
-            astroid.NotFoundError,
             astroid.AttributeInferenceError,
             IndexError,
         ):
diff --git a/pylint/config/option_manager_mixin.py b/pylint/config/option_manager_mixin.py
index cf21a1d605..02c6997af0 100644
--- a/pylint/config/option_manager_mixin.py
+++ b/pylint/config/option_manager_mixin.py
@@ -44,6 +44,7 @@ def _expand_default(self, option):
 
 @contextlib.contextmanager
 def _patch_optparse():
+    # pylint: disable = redefined-variable-type
     orig_default = optparse.HelpFormatter
     try:
         optparse.HelpFormatter.expand_default = _expand_default
diff --git a/pylint/pyreverse/inspector.py b/pylint/pyreverse/inspector.py
index 7a509e16fb..11dcf7179c 100644
--- a/pylint/pyreverse/inspector.py
+++ b/pylint/pyreverse/inspector.py
@@ -172,7 +172,7 @@ def visit_classdef(self, node):
         try:
             node.implements = list(interfaces(node, self.inherited_interfaces))
         except astroid.InferenceError:
-            node.implements = ()
+            node.implements = []
 
     def visit_functiondef(self, node):
         """visit an astroid.Function node
diff --git a/pylintrc b/pylintrc
index 5b2bc31dea..a603e61a7d 100644
--- a/pylintrc
+++ b/pylintrc
@@ -20,6 +20,9 @@ load-plugins=
     pylint.extensions.check_elif,
     pylint.extensions.bad_builtin,
     pylint.extensions.code_style,
+    pylint.extensions.overlapping_exceptions,
+    pylint.extensions.typing,
+    pylint.extensions.redefined_variable_type,
 
 # Use multiple processes to speed up Pylint.
 jobs=1