In 'First Contact' the Borg break into Sickbay, only to be confronted by the holodoctor who gripes: "How come Voyager's EMH gets the sexy Borg?"
The scene in 'Insurrection' where Data inflates himself as an emergency flotation aid is accompanies by an loud 'breaking wind' sound.
Watching the DVD version of The Wrath of Khan reveals that certain moments were censored to avoid an R-Rating. For instance Kirk actually yells: "CUUUUUUUUNT!"
THE MOTION PICTURE
Kirk views the Klingon's attempt to destroy V'ger and asks: "What's with those funny ridges on their foreheads?"
Ilia: My oath of celibacy is on record, sir.
Kirk: Very proper, Lieutenant.
Ilia: As is your tendency to break Starfleet regulations.
Kirk: Er, of course...
Ilia: And your reputation as an interstellar libertine...
Kirk (whispering): All right, all right! My quarters in five minutes, OK?
Ilia (sighs with relief): Thank you sir. I didn't think I could hold on for much longer.
THE FINAL FRONTIER
Scotty rubs his entire body in lubricant, then a dozen members of his Engineering crew rupture themselves trying to push him into a Jeffries tube.
Spock: "As my captain said: what does God need of a starship?"
Bones: "You hosted 'In Search of Ancient Astronauts' and you never asked that question?"
THE UNDISCOVERED COUNTRY
Hearing a prophecy that James T. Kirk will bring disaster on their race, a Klingon warrior uses Suliban technology to travel forward in time. He slays Kirk on the prison planet in The Undiscovered Country (it was actually the shapeshifter that got rescued) and as proof brings back Kirk's hairpiece, a creature called a tribble. Which then starts to breed...
Spock: This is Lt Valeris, the first Vulcan to finish at the top of the graduating class…
Kirk: Spock, you didn't tell me Vulcan women had such great tits!
(Spock gives colourful metaphor)
Uhura: What about all that equipment we have on board for cataloguing gaseous anomalies?
Spock: The correct terminology is The Fart Detector, Lieutenant.
GENERATIONS
In order to maintain continuity with Voyager we overhear Tuvok on the Enterprise-B discussing with other the bridge crew the new 'bobbed-ear' Vulcan fashion.
Demora Sulu: "My father told me some interesting stories about you, Captain." (Leans forward and whispers) "I'll be in my quarters, dressed in my seifuku."
Kirk: "Scotty, keeps things together till I get back."
Scotty: "I donna know captain, just one more cheeseburger and I'll blow!"
Riker: "Bad food, brutal discipline...no women..."
Picard: "You're right Number One...send the holographic cabin boy to my Quarters."
NEMESIS
Data: "To hell with our orders. Lock and load!"
Picard: "What about the Laws of Robotics?"
Data: "R. Daneel Olivaw is a pussy."
A flashback scene we see Romulan agents abducting young Ensign Picard and forcibly shaving his head.
Another scene shows staid Picard after the climatic battle trying to avoid the amorous attentions of the female Romulan commander who's pissed on Romulan ale.
PICARD: *Admiral* Janeway? What, they promoted you because of your respect for the Temporal Prime Directive?
JANEWAY: Listen Baldilocks, every other Starfleet Admiral you've met has been plotting to subvert the Federation's core principles...I fit right in! Anyway, who are you to talk about the Temporal Prime Directive?
PICARD: Well at least I never ended up on the far side of the galaxy during a routine tactical mission into the Badlands! I suppose they've got you instructing in astro-navigation at the Academy?
JANEWAY: Talk to the hand, bitch. I'll have you know I made First Contact with more species than Captain Kirk, and without sleeping with any of the bastards!
PICARD: Sure, if I could just turn MY Number One into a lapdog, I'd be able to take credit for everything he does too!
THE VOYAGE HOME. Chekov has been captured by the US navy.
Officer of the USS Enterprise: "OK, who are you and what are you doing on our ship?"
Chekov: "My vame is Pavel Chekov. I am looking for nuclear wessels."
Enterprise officer: "You're not fooling anyone with that accent."
THE UNDISCOVERED COUNTRY. Tuvok serves Captain Sulu a cup of tea.
Sulu: "Outstanding! Wait a minute, how come I haven't seen you before?"
Tuvok: "I have been retconned, sir."
Sulu: "Oh my God."
Praxis blows up.
Sulu: "Shields! And seatbelts!"