If you're like me, it drives you crazy when you see an actor/actress in a movie and know you've seen them somewhere else. So, mostly for fun, and partially for sanity's sake (so you can watch a movie without being distracted) I give you: "What ELSE were they in?!"
Mary Wickes is one of my favorite character actors. She was a spunky comedienne and a scene-stealer whose abrupt, tell-it-like-it-is demeanor made her an audience favorite in movies and TV for over six decades.
You might recognize her as:
Miss Preen from The Man Who Came to Dinner
Stella from On Moonlight Bay and By the Light of the Silvery Moon
Emma Allen from White Christmas
Matilda Runyon from It Happened to Jane
Mrs. Squires from The Music Man
Sister Clarissa from The Trouble With Angels and Where Angels Go Trouble Follows
Miss Wiggington in Snowball Express
Sister Mary Lazarus from Sister Act
Aunt March from Little Women (1994)
Liz O'Neill from The Danny Thomas Show
Delores Bastinado from Zorro
Miss Cathcart from Dennis the Menace
She also made 7 appearances on The Lucy Show and 9 appearances on Here's Lucy - she and Lucille Ball were good friends and neighbors.