In one episode, Johnny and Dukey virtually enter a stuntman's apartment as a lady walks toward the stuntman and start to kiss each other, which (with the use of censorship) cuts to Johny being grossed out and attempts to get out along with his dog.

Eugene, aka Bling-Bling Boy, romantically suedes Susan Test.

There are ogling and flirtations focusing between the Test twins and Gil. The twins occasionally wanted Gil shirtless in several episodes.

Some violence in some episodes but no blood.

The episode "Who's Johnny" has him briefly turn into a vampire during a school project with his partner (long story) and declares that he wants to suck her blood, but states that this project is "sucky enough" for him.

some tiny bad words (such as stupid, idiot, etc.)

A one-shot character in the episode "Johnny's Monkey Business" is shown having a cigar in his mouth.

Dukey drinks coffee, in which you should never give to dogs in real life.

none. Only expirements which have nothing bad to do with them except for expirement fails.

Rude noises, such as farting, are present in the background in later episodes.

None/Mild/Moderate in a lot of episodes.

Fart noises in the background are present, usually when something disappointing happens.

Mild/Moderate for neurodivergent viewers.

Johnny Test farts fire.