Here are two great slip ups but you will need a little patience to review them (I suggest you play it over and over until you see it).
1) OK...In the Chinese alley fight scene when Dylan is on the creepy thin man's back, he slams her up against a wall the rips her hair out and she rolls up against another wall. Right after she yells "Ouch" There is a cut and we see Natalie in the distance; she is getting up (from when the man threw her into the fence). In the next cut we see her do exactly the same thing; get up. It might sound funny here but if you watch it it is good.
2) Right after Natalie gets up (same scene) the thin man throws his sword thing at her and she dodges it. We see him run; where, we don't know. All the angels follow him. Next second we are back on the other side of the fence. Now, if you remember back to the start of the fight, the thin man had to side roll through the slot in the fence, Natalie had to jump over it and Alex and Dylan had to climb over it. This took about 10 seconds. There is not possibly enough time for them to get back over the fence and continue the fight because the fence was well padlocked and it didn't look like it was gonna open.
NOTE: You can tell that the second slip up is true because of the yellow tunnel that the thin man exits from. When the angels dodge the bullets at the start, Natalie jumps to the same yellow tunnel and I really don't think that there could be two yellow tunnels with exactly the same tags on them in the same alley.