At the handover before the van explodes, the scene is of a deception to make Mattock think Damien is in the van when he is actually in a car outside, however during a shot inside the van you can see Damiens arm and then a few second later you can see his face through the windscreen, the van explodes then Damien arrives in an Audi. There must have been some improvisation of this story line else why would Damien have even been in the van when they shot the scene.
The symbol for Delta is wrong - it should be the symbol for Army Special Operations Command, which is a red arrowhead with a black sword in the middle, not that weird "D-Force" triangle. His rank insignia is also the wrong design and placed on the uniform incorrectly. On BDUs (the uniform Damian is wearing in the photo), the rank insignia are velcroed onto the front of the chest or pinned onto the lapels, but never velcroed onto the lapels.
When Knox hands Lilian the copy of Damien's file, there are several mistakes. First, the beret that Damien is wearing is the wrong color - it should be tan or green, depending on if he was a Ranger or Special Forces before he joined Delta, respectively.