Visible crew/equipment: At the funeral of William Wallace's wife, Murron, a white van can be seen. He bends down to kiss her and as he stands back up, if you look over his left shoulder through the trees you can see the van going past. It's very quick, small, and blurred, but it's there.
Visible crew/equipment: When Wallace captures the fort of the noble who killed his wife, he pushes said noble down a hill before putting him to the post and slitting his throat. If you watch when the noble is pushed, he rolls over and the cape uncovers the back of his costume. You can see blue pants that look like jeans under his costume.
Visible crew/equipment: At Stirling right before Wallace drops his sword and picks up an axe you can see some black duct tape on his sword. A man then swings his sword at the exact position of the duct tape. This is an obvious test take where they rehearse the scene, and was not meant to end up on screen.