This is yet another time where a minor profanity (at least for TV-Y7 standards) is said or seen on-screen on a Nickelodeon show. In this case, Ren said "crap" while replying to Stimpy talking about Yaksmas.
The Pope from 'Powdered Toast Man' makes a cameo in the baseball scene of 'Reverend Jack'.
Ren and Stimpy are show in the same uterus in this episode, this could mean they are biological brothers.
Causes of Stimpy's deaths in 'Terminal Stimpy': he is ground to pieces, shot, drowned, struck by lightning, swallowed by a boa constrictor, hit by a bus (twice), flattened by waste dropped from a jet plane, and blown to bits (with Ren).
Stimpy's obituary reads 'Stimpleton Cadogen Hit by bus!!! Remains missing! Police Baffled, Born in 1927, Stimpleton "Stimpy" J. Cat had risen the corporate ladder to heights previously unabtainable by filthy street vermin.'
Stimpy's obituary gets his name wrong--it's written "Stimpleton Cadoogan". It should be "Stimpson J. Cat" or perhaps "Stimpson Kadugan", right?
Guests that arrive at the dinner party include Mr. Horse, Muddy Mudskipper and his ape wife Gorgo, the baboon from 'A Yard Too Far', Kowalski, the "Hey It's That Guy!" announcer/salesman, Haggis McHaggis, the chicken from 'I Love Chicken', the Shaven Yak, Powdered Toast Man, and Professor Fly and his date, a rotting piece of steak.
The numbers that Muddy was stamping on the license plates were all episode numbers from the show.
When Stimpy popped a pimple, he bit his tounge off. Then when he gave Ren his food, it was there in his mouth.
Goof: When Stimpy is hanging on the phone lying on the couch, he has a chest-hair. After he pressed a button on the phone, the chest-hair is gone.
The Seasons 5 and Some More of Four DVD set alters the following scenes from 'Bellhops':
1. Ren and Stimpy clean a hotel room, but destroy their work after slamming the door hard.
2. A brief few seconds of Ren waiting at the pool area of the hotel.
In 'Ren's Brain', when the giant corkscrew is being alligned over Ren's skull, and then later used to remove a giant cork - the corkscrew is animated turning in the wrong direction - it would have been unscrewing the whole time.
In 'Hair of the Cat', Ren gets out of bed at 3:00am, which seems rather earlier than their usual wake-up time.
In the episode 'Wiener Barons', Ren and Stimpy lived in America, but in this episode they live in Russia.
When Stimpy first leaves the studio for the strike, Ren pulls off Stimpy's nose ("studio property," he says) to reveal a human-like nose underneath. All other shots of Stimpy afterward when picketing, he has his blue nose back on.
Ren's birthmark dissapears.
Ren's webbed duck foot is gone and is replaced with his normal one.
The moon has no atmosphere to allow living beings to survive without specialize suits, like a spacesuit, and yet a Lobotomized Ren seems to breathe just fine.
Lobotomized Ren was given arms just before his speech at the end, but seconds later they're gone.
If you look closely at the crossword puzzle the doctor was doing, you can see the words idiot, dumb, and commie written.