1) The very first sentence with the childhood dream stuck in scarp might bamboozle you, that's more or less a throwaway line, that came to be from Le Petit Nicolas theme song. Not sure how, tho.
2) There's quite a number of movie quotes in this one, most numerous are ones from Shrek, for its oldest Czech dub is golden. Others are from 12 tasks for Asterix, and the Mezgá family, which are all cited by Pepa. The Robots cameo is there because we have harvest festivals associated with Bigweld, if I recall correctly he's singing about them at one point in the movie.
3) Setting fries on fire is another thing Mates did in the kid safety show, he's got pretty bizarre track record, but that's why we love him. I've joked a few times about starting a cult around him, which did appear here. Why followers of Mates don't wear legwear is a bit more complicated - basically the show has animated segments in between the live action ones, and the cartoon stand-in for Mates has trousers colored white in the second season, and it looks like he has no trousers. Once this comes to your mind, you can't unsee it.
These family lore bits are really freakin' weird, I'm sorry
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4) Mekbakery is inherently associated with exploding, that's why Mekbakers are relieved it did not happen.
5) "Velký záhon", or "Big Flowerbed", is a reference to old movie "Nezralé Maliny (Unripe Raspberries)", about old classmates who decide to have a reunion event for one last time. One of them, mr. Šandroch is resident in a Retirement Home and is a know troublemaker there. There's a scene where an old lady is complaining about him to the head nurse and tells her about all his horrible deeds, one being "and, excuse my language, he urinated on the big flowerbed". Here it's just a hint that Gerolt couldn't find restroom.
Then there is the line with the customhouse which is from fairy tale "Tři veteráni (Three Veterans)", that's about it.
6) Nobod Murf is Nobody Smurf from Hanna Barbera Smurfs, and we hate him.