Season 2 Episode 13 - The guest star, Rudolf Nureyev is seen in a sauna with nothing on but a towel, the scene is not brief. Miss Piggy then tries to seduce him, following that they sing "Baby It's Cold Outside". TV-PG-S

Season 3 Episode 11 - Raquel Welch dances with a giant spider in a revealing outfit singing "Baby It's Me". Following that she seductively talks to Fozzie, the episode is inneundo laced. TV-PG

Season 4 Episode 11 - Lola Falana sings "He's the Greatest Dancer" in a slightly revealing outfit.

Kermit and Miss Piggy are in a relationship, very tame. Kissing between humans and muppets are seen though not sexually, kissing between muppets are seen very rarely though.

Subtle inneundo, though not very suggestive

There's also lot of Slapstick/Cartoon Violence throughout between humans and muppets, but no one gets seriously injured, just played for humor.

Explosions and bombs are frequent as is gun use, muppets get battered up though not particularily injured, it is all comic violence, not graphic. Miss Piggy typically karate chops Kermit, or anyone else who offends her, played for laughs.

Separate uses of "god" in the Ruth Buzzi, Jim Nabors, and Chris Langham episodes, and notable uses of "hell" in the episodes that feature Harvey Korman, Alan Arkin, and Mac Davis respectively.

Characters and guest stars smoke cigarettes occasionally.

Cigars are infrequently smoked by muppets and celebrity guest stars. Occasionaly, alcoholic beverages are seen though not consumed in any way.

The Vincent Price episode could scare young kids due to it's spooky theme.

There are also some culturally insensitive and stereotypical depictions of human and puppet characters, including Native Americans, people from the Middle East, and others. Since this is a kid friendly show, this is not meant to be offensive, it played for laughs.

The Alice Cooper episode has some frightening musical numbers, and features Alice Cooper trying to get the muppets to sell their souls to the devil, though mostly comically.

The Liza Minnelli episode features muppets being murdered in a play, nothing too intense, and it has a happy ending.

Nothing much, though the explosions might scare the kids.