What do these episodes have in common?

New Doctor

Miss Landers’ Fiancé

Beaver’s Prize

Box Office Attraction

Wally’s Weekend Job

Beaver’s Tonsils

Another question: When does Ward mention it’s embarrassing like someone walking in when you’re taking a shower?

And when does Ward say “there go my dreams of romance.”

Answering in stages, the shower question was in "Who Died?" (Wally and Dudley). June was talking to Mrs. McMillan, and handed the phone to Ward, who was irritated at having to suddenly improvise conversation with a stranger.