Your wish is my command, heralde! I had a few minutes left on my allotted viewing time after I took in "Muppets Go to the Movies," so I went back downstairs to the library and punched in "Puppetman." So here's the stuff that I wanted to comment on.
I noticed that after Richard - that, is, Del - gave Zack a peck on the cheek and lifted him up onto the table, for most of the rest of that scene he sat right by Zack, as if he was guarding him. Which he pretty much was. You how Bud, thinking that Zack was the son of the station manager, slipped him a $10 - but when he realized that Zack was Gary's kid, he tried to take the bill back. So while the dialogue is going on, Bud's trying to take back the money, and then Del puts his hand on Bud's arm and pushes it away.
You might have caught this, but during that same scene, I noticed that while the manager was giving the doom-and-gloom speech, Holly was standing behind Del and giving him a shoulder rub.
Rita's certainly the prima donna - and you're right; that is a rather racy-looking getup she's wearing in the latter half of the show. Gertha used the word "tramp" to describe Rita's appearance, but the word that popped into my mind was "floozy." And during "You Are My Sunshine," there's Rita with Gertha, looking all cheery for the camera, and down behind the set, there's Del, who was probably wondering for the millionth time how he got dragged into doing that number. At one point, it seems he looked at the camera as if to beg the viewers to help him.
Other stuff...it was the junior Bud (the oh-so-hip dude) who told Del to "break an arm!" And the "we are not amused" look that Del shot him was priceless. In terms of on- and off-set relationships: Del is good pals with Gary and Holly, adores Zack, barely tolerates Bud Sr., could probably do without Bud Jr. and can't stand to be in the same room with Rita.