John Brown is a bumbling but well-intentioned security guard who is badly injured in an explosion planned by an evil mastermind. He is taken to a laboratory, where Brenda, a leading robotics surgeon, replaces his damaged limbs with state-of-the-art gadgets and tools. Named "Inspector Gadget" by the press, John -- along with his niece, Penny, and her trusty dog, Brain -- uses his new powers to discover who was behind the explosion.
A bowling ball is launched up into the air during an explosion and lands on the villain’s hand, presumably crushing/amputating it. Nothing is shown but he screams and says “my hand!”
Later, he’s shown with a mechanical hook/claw prosthetic
Although not shown (kittens head is in the cup) and you just hear the kitten gag/burp.. The moment shortly after that where the person drinks from the cup and gags himself made me triggered (he literally drank cat V*)...
No, but a guy’s eyes roll around cartoonishly in their sockets after he gets clotheslined and falls down. I doubt it would make anyone squeamish, but I’ve mentioned it just in case
To add to the other comment (so also spoilers), the spider scene happens around 1 hour into the film, when Gadget and his evil clone are about to fall off a bridge, and he gets a phone call.
There's also a brief close up of the spider in a pod earlier in the film, when the evil Gadget first wakes up