Hey, I got bored and decided to list all the outside references in IVAN I could find... in the dialogues, mainly, there are some other ones obviously in this great game (hattifatteners, etc.).
"The belt of levitation is really useful for large people!"
- Huang Ming Pong
Dune reference (Baron Harkonnen and his levitation belt)
"New Attnam, shit, I'm still only in New Attnam. Every time I think I'm gonna wake up back in the dungeon."
- Rookie Guard
Apocalypse Now reference.
"We are the Imperial Guard. Bow."
- Elite Guard
I'm not quite sure, but isn't this Star Wars reference?
"The Wise know that the world is really a square pancake which He carries on His back."
- Priest of Valpurus
Reference to Hindu/Arabic/Discworld beliefs.
"Can you believe it, the dude tried to take from us our natural right to carry a spear in the street!"
- Hunter
An obvious Second Ammendment reference.
"You will install the One OS. Resistance is futile. Prepare to be assimilited."
- Pure Mass of Bill's Will
Star Trek AND Microsoft reference!
"Leg bone is connected to the hib bone, hib bone is connected to the rib bone..."
- Skeleton
The song reference.
"'Tis but a scratch." and "That's just a flesh wound!"
- Dark Knight
Monty Python and the Holy Grail reference.
"I see dead people."
- Necromancer
Sixth Sense reference.
And my favourites:
"Vodka strong, but meat rotten."
- Ivan
A reference to an anecdote in machine translation, where "the spirit is willing, but the flesh is weak" was turned into the above when auto-translated into Russian and back to English.
"Ivan meet Vladimir first in magic test area near Voktsovadil."
- Ivan
Voktsovadil is an anagram of Vladivostok.
Anything else? I may have missed something
Edit: Oh, yes. The Gods' and archangels' names are all obviously Latin words (apart from Scabies, I guess), which most folks know about. "Vesana", as in Genetrix Vesana, is also apparently a Finnish word for "sprouting". "Genetrix" in Latin is a fancy term for "mother".
"The belt of levitation is really useful for large people!"
- Huang Ming Pong
Dune reference (Baron Harkonnen and his levitation belt)
"New Attnam, shit, I'm still only in New Attnam. Every time I think I'm gonna wake up back in the dungeon."
- Rookie Guard
Apocalypse Now reference.
"We are the Imperial Guard. Bow."
- Elite Guard
I'm not quite sure, but isn't this Star Wars reference?
"The Wise know that the world is really a square pancake which He carries on His back."
- Priest of Valpurus
Reference to Hindu/Arabic/Discworld beliefs.
"Can you believe it, the dude tried to take from us our natural right to carry a spear in the street!"
- Hunter
An obvious Second Ammendment reference.
"You will install the One OS. Resistance is futile. Prepare to be assimilited."
- Pure Mass of Bill's Will
Star Trek AND Microsoft reference!
"Leg bone is connected to the hib bone, hib bone is connected to the rib bone..."
- Skeleton
The song reference.
"'Tis but a scratch." and "That's just a flesh wound!"
- Dark Knight
Monty Python and the Holy Grail reference.
"I see dead people."
- Necromancer
Sixth Sense reference.
And my favourites:
"Vodka strong, but meat rotten."
- Ivan
A reference to an anecdote in machine translation, where "the spirit is willing, but the flesh is weak" was turned into the above when auto-translated into Russian and back to English.
"Ivan meet Vladimir first in magic test area near Voktsovadil."
- Ivan
Voktsovadil is an anagram of Vladivostok.
Anything else? I may have missed something

Edit: Oh, yes. The Gods' and archangels' names are all obviously Latin words (apart from Scabies, I guess), which most folks know about. "Vesana", as in Genetrix Vesana, is also apparently a Finnish word for "sprouting". "Genetrix" in Latin is a fancy term for "mother".