Continuity

The girl in green holds a knife, a shot later she raises her hands without it, and then it comes back to her hand. Min: 40:20

Miscellaneous

When the guy in blue kills a zombie after he stubs it (Minute 31:40), you can clearly see there's no blood at all on the stick, although it was inside the zombie's body.

Continuity

The girl in green holds a knife (minute 40:20), a shot later she raises her hands without it, and then it comes back to her hand.