Visible crew/equipment: When the Kurgan is fighting Ramerez he hits the wall and stones fall on him. A crew member can be seen pushing the stones out. (00:56:35)
Visible crew/equipment: When Newton is playing with the robot arm and the piano you can clearly see wires attached to the top of it controlled by the puppeteers.
Visible crew/equipment: In the closeup shots of the soda cans shooting out, you can very clearly see the the two hoses which are making the sodas shoot out.
Visible crew/equipment: In the scene where Sulu flies the helicopter and accidentally turns on the windshield wiper, look closely at the bottom of the wiper and you can see the crewman's finger manually moving the wiper. (01:18:55)
Visible crew/equipment: In many of the racing scenes the camera crew's shadows can be seen at the bottom of the screen. (Corrected in the DVD version).
Visible crew/equipment: At the end when Harv leaves, you can see a crew member reflected in his car window. It's not any of the Brown family members, because they are walking to their house. (01:21:20)
Visible crew/equipment: In the Reactor Room scene, where the Marines first encounter the aliens, there's a part where Dietrich is grabbed from behind and accidentally ignites Frost with her flamethrower, causing him to fall down the stairwell. As he's falling, if you look, you can see part of a leg and a cable belonging to one of the technicians on the set. (01:14:05)
Visible crew/equipment: When the Overlord is busy destroying the Diner, when he starts destroying stuff on the counter, you can see the small rods pop up that flip the saucers and glasses into the air. You can also see the compressed air they used, to aid with the effect.
Visible crew/equipment: When Jeff Goldblum is first showing his telepods to Geena Davis, as the door to the first pod opens, you can see a reflection of a stage hand in the lower left corner of the pod door.
Visible crew/equipment: Special effect projectors and strobe lights can be seen in a reflection on Max as the ship is descending towards the bay - moments before blasting into hyperspace to return David to his home in 1978. (01:22:15)
Visible crew/equipment: The fake spider that suddenly swings down in front of Allison in the hallway, and the one "thrown" at her as she walks through the mall at the end, are obviously prop pranks, as you can hear a fake laughing in the background during the latter. Very badly covered up by barking dogs and something whining.