Deliberate mistake: When the creepy building handyman falls onto the table-saw, it slices what appears to be his leg (or possibly arm) clean off. Except the saw-blade wasn't big enough to go right through his entire thigh (or upper arm for that matter), though... it only sticks up a few inches.
Continuity mistake: When Chucky is controlling the car with the police officer's mother inside of it, pay attention when she says the line "You hobbit, mother****er!" In that shot, she doesn't have her seatbelt on. However, both before and after this shot, she has her seatbelt on. (It doesn't get taken off until a few shots later).
Answer: The employee's bosses overworked and abused him. He was depressed, had emotional issues, and probably felt his life was hopeless. Before committing suicide, he wanted retaliation against the company for making him so miserable, so he disabled the safety protocols on the "Buddi" doll's computer chip. Mostly, it's a convenient plot point to explain how Chucky came about.
raywest ★