Alien Resurrection (1997)

Continuity: Ripley kills the alien in the corridor after it has killed the first member of the Betty crew but there is no melting of decks or bulkheads from the creature's acidic blood. Also, the Betty crew seem unaffected by all the acid.

Revealing: When Hillard throws the basketball at Ripley, you can clearly see the white tape on Ripley's hand which was used to catch the ball.

Continuity: When the whole crew of the Betty are being arrested in the Mess Hall, Christie puts his hands behind his back to get the guns on his arms. But in the next shot when Christie is behind Wren his hands are by his sides. There's no way he could put his hands by his sides without the guns showing.

Sigourney Weaver actually makes the basketball shot. Even though the ball is out of shot for a second, she made the shot with no assistance.

In the scene where Ripley discovers the room full of failed clones, she stumbles upon Ripley 7, a hideous, malformed but still living clone. The entire scene after she discovers her ill-fated 'sister' is ripped directly from, and is an homage to, one of the most famous deleted scenes from the original Alien. Ripley finds a long dead Brett and barely living Dallas cocooned in the bowels of the Nostromo, and Dallas asks her in a pathetic, painful voice to kill him. She obliges by using her flamethrower. The scene in Resurrection is almost 100% identical, everything from the design of the flamethrower to the emotional reaction and facial expressions she had in the cut Alien scene.

Purvis is one of the human hosts for an alien and it rips through his chest on the betty. On an episode of 'the x-files', the man who plays Purivs plays a scientist who is a human host of an alien which burst through his chest.