coarse language: sure, but the occasional dab nabbit can be used for character development.
disparage a certain demographic: what about idiots? I understand not making fun of minorities, but the best slapstick usually makes fun of idiots. Or country bumpkins. There's a great skit where two cops end up moving a dead guy from one spot to another because they didn't know how to spell the first.
cross dressing: there are hilarious skits involving damsels in distress or pregnant women. A pair of socks or a pillow adds to it. The guy in the doctor's office that collects everyone else's ailments. Starts with a cough, a cold, itching, ... and finally a pregnant woman walks in and the guy runs off screaming.
death and violence: lots of skits with someone dying with over exaggerated motions. Or evil people just being evil. Death is usually used to setup the punch line.
toilet humor. ever see the one with the SM riding a roller coaster while the audience is told he's on the toilet? I know. this one can get out of hand really easy but let's face it, the bean scene in blazing saddles was funny.
inside jokes: yeah, those just aren't funny.
alcohol: I haven't seen it either way, so I'd be fine with this restriction. But you know, a country bumpkin sipping out of a paper bag could be funny.
I hate to say this, but most humor involves pain and ridicule. There's always a line that shouldn't be crossed. Rather than rule out anything that could be anywhere close to that line maybe a better approach is to start showing scouts how to find that line. And if they go too far it's an opportunity for them to learn how to apologize. Skits are fun. Be careful not to throw the baby out with the bath water (that's both death and toilet humor )