As with many of the shows, there's a charming tendency for Syd and Eddie to genuinely struggle not to laugh during some of their routines. A sketch where Eddie gives Syd food in "zero gravity", causing various food items to splash into Syd's face, has smiles from them both, and Eddie nearly fluffing a couple of lines as he tries to contain his laughter.
A skit with Eddie sitting at a piano sees him genuinely appear to slip as he sits down on the stool. Later Eddie fumbles his pronunciation of the word "accompaniment", causing himself and Syd to jokingly repeat it.
A shot of the studio audience around the 33 minute mark reveals a man in a red sweater clapping obediently, but with a rueful look on his face, as if he didn't find the show funny and regretted attending.