The items Roger pulls out of the box, minus Steve's diary are weapons in the board game Clue. Like the board game, this episode is about finding out who is a murderer at a dinner party.
Klaus says the last place he worked at had 3 Michelin Tires instead of Michelin Stars which is a restaurant term
When Steve mentions that Tonington killed it in rehearsals and they embrace and wink at each other Bullock can be heard in the background saying *cough* "casting couch" *cough*. Casting couch is a term for someone that gets a job they aren't qualified for, or good at, because they had sex with the boss during the interview. It is also a genre of pornography where a girl interviews for a job and the "boss" tells her he'll only hire her in exchange for sexual favors.