Two gross parts I don't like in this movie

Eddie is Ellen's cousin-in-law so they're not blood. Katherine is blood.

That is a running gag that Beverly D'Angelo and Randy Quaid kept throughout each of the Vacation movies they were in together. In each story he always tries to hug her at one point and she always manages to squirm away from him just in time. It's visually hilarious because he's so much taller than she is and she literally just slips away out from under his arms every time 

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George Lassos the Moon
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It seems many people dislike the pool fantasy scene but all that the National Lampoon's group is doing is mimicking that scene from Fast Times at Ridgemont High in essence. The scene isn't funny, that's for sure, which is what you hope for in these style movies - non-stop hilarity.
I'm not saying that's a scene I like, I just think they are trying to play off a scene from an older and just as funny (if not funnier) movie.
The scene with the YUPPIE neighbors after the jog is pointless. "After a shower of course." "Of course."

I didn't find that scene gross per se, but I did find it incredibly dragged out and boring. It isn't funny, it adds nothing to the plot, it's just bland filler.

I think the scene where Clark is imagining seeing that sales lady in a pool was gross!

Or when Clark is at the mall and meets her at the counter and she pulls up her skirt to show her underwear.

All this talk about things being gross and people mention the hot chick in the pool and not the dog's mucus?

Yeah I agree, Eddie licking jello off Ellen's finger was really gross. Her face said it all.

>However, the RV toilet scene is one of the jewels of this film. Even if it is nasty, it's hilarious at the same time, and necessary to help culminate part of the chaos at the end of the film...

It would have been just as funny, and a lot less disgusting, if they didn't show a closeup of it.

It seems that they have a penchant for animal cruelty in ALL of the Vacation movies.
1. The dog tied to the bumper
2. Throwing the hat off the the Eiffel Tower and the dog chasing it. The dog is okay, but still
3. The cat
4. Vegas Vacation: When they used the snakes as babysitters.

Well I'm sleeping with your father. Don't be so dramatic.