In the first and second acts there were a few times when audience members yelled out things/whistled. Did this happy at all the performances so far? At one point when Henry was looking for the ledger, an audience member said "It's under the chair." Then Henry went on a rant about how he hated the audience for calling out and that we were all laughing to much.
Another part was when Dave and Rob had to kiss in Act 2 (while he was filling in). An audience member whistled when they heard they had to kiss and the two men did a full on kiss for about 3 seconds. The audience erupted into laughter and then proceeded to clap while both men smiled.
Also in Act 2 the audience chimed in, when Rob forgot how many times he banged the bell for the clock to strike 12, and counted along with him.****** End of Spoiler *****
Sidenote: Dave Hearn is truly walking away with the show. He milks every line and or pratfall for everything that it is worth. Doesn't hurt that he isn't to bad to look at and has a beautiful smile to boot.