If there's any message in this series, it's that being smart, witty, and a bit cynical can draw lots of laughs.
Joel/Mike and the robots are imprisoned on the Satellite of Love but there's never a hint of any real menace. Some movies feature monsters and murders but the snickering commentary and frequent break-ins dispel any scariness.
Largely depends on the movie being lampooned. Some are quite suggestive, i.e. lots of girls in scanty clothing and some implied sex. But since the shows originally aired on television, there is no nudity.
Depends on the movie being featured, but any curses stronger than "hell" are generally cut out. The mad scientists and the Satellite of Love denizens frequently mock each other, but that's more of a nerdy rank-out designed to display superior intelligence than true insult.
Characters in some movies may smoke, drink, or do drugs. Many movies do take place in a criminal milieu.