The Big Bang Theory: 15 Insane Details You Definitely Missed
3. Sheldon And Leonard Have A Photo Of Howard's Mother On Their Fridge
Here's a heartwarming detail about the guys' apartment. Following the sudden passing of Mrs Wolowitz in the season eight episode "The Comic Book Store Regeneration", a wallet-size picture of Carol Ann Sussi - the actress who voiced the overbearing Wolowitz mother who actually passed away - can be seen in each subsequent episode.
This, it seems, was a gesture from Johnny Galecki, who plays Leonard, and Steve Molaro, the Big Bang Theory's showrunner. Molaro explained the situation to the Hollywood Reporter during a 2015 interview, explaining how the decision was made early on to have this as a tribute to Sussi:-
"After we had that impromptu memorial the morning she passed away, Johnny and I were hugging - like everybody was - and right then we found our prop person and asked to get a little picture of Carol Ann and we put it on the refrigerator [in Leonard and Sheldon's kitchen] so she's there in every episode now. It's so small you wouldn't even see it, but on the fridge is this tiny little wallet-size picture of Carol Ann that's been there since the day she passed away."
It's a brilliant tribute to a typically unseen member of the cast.