Most of the Larry and Phyllis sketches had a narrator introduce each skit, describing what their dilemna was to the sound of soap-opera organ music. I don't recall any regular ambient background music, unlike the Buddy & Jim/Wally & Ralph sketches.
One such Larry and Phyllis routine involved hanging a poster on the wall. Larry had a poster of himself, Phyllis had one of her, and they kept tearing each other's poster down and putting up their own.
Larry: (in an angered voice) "PASTING on the WALL??"
Phyllis: (while calmly applying glue, I think with a paintbrush) "On the wall..."
When they reached their "Cooper... copper... co-operation" stage, they hung up a poster of the both of them. (if only real life were that simple) They then lovingly put their arms around each others back, in a stance similar to that in the picture.
Exactly once I saw a L&R routine in which they were arguing over what TV show to watch. With the back of the TV aimed away from us, we had them constantly changing the channel using the "turret" changer (read: clunk-clunk) that was (gasp!) on the set itself! (Although remote control was around since the 60s, it was quite rare until, I'd say, 1980) They did co-operate at the end, but I cannot remember how they resolved this one, since this was the year before the VCR was invented. Maybe it was like the Berenstain Bears solution; today we watch my show, tomorrow yours -- as if regular network TV scheduling would enable that.