Continuity mistake: When El Blanco is outside Burt's home, and leaves, there isn't any hole in the ground after him. Later, in the movie, when El Blanco gets underneath the earth, he leaves a big hole after him. Why wasn't it like that the first time?
Continuity mistake: When Burt is at the gas station, he makes change with the box top of the pump. he closes the box. Jack approaches to meet him and the shot cuts to Jack and the rock is all ready on top of the box. we cut back to Burt and he is placing the rock on top of the box.
Continuity mistake: When Burt's truck goes off the cliff and they go to the hill to find Miguel and his truck side-by-side. The truck now has different rims than before.
Continuity mistake: After Jack digs down to the graboid he throws the shovel down, the next shot the shovel has moved next to the chainsaw