Factual error: It is a Level 2 Sentry that is sitting by the Engineer on his left. But as the camera pulls back, and then does a jump cut further away, the Level 2 Sentry is seen suddenly firing rockets. But only Level 3 Sentries can fire rockets. Also it's still pointing to the right of the screen and shooting bullets visible while the rockets fire towards the left of screen. Even Level 3 sentries can't fire in two different directions at once. (00:01:15)
Factual error: When the Level 2 Sentry gun begins firing, you can see Shotgun shells falling out of it instead of the usual ammo casings. (00:00:40)
