After customs, Adrian Mount goes to the restroom to burn a passport. He pulls out a passport with a leaf cluster and crown that is not a U.S. passport but burns a U.S. passport in the next frame.
In the diner scene, Reacher's sandwich goes from having one bite to two bites to no bites while shifting positions without being touched.
At around minute 42, the antagonist uses a two inch long blade to slice one man's throat and stab a guy in the abdomen. The first one is instantly out, lying on the ground, face down, the second one is shown dead, hitting the ground with open eyes.
Neither of these two injuries kill instantly, or knock you out.
At 35.30, when A.M. sets his suitcase on the toilet in a public restroom, the stool has a lid. Toilets in public restrooms don't have lids, only seats. Even the toilet in the next stall, which becomes visible when the camera pans in the shot, has no lid.
When Reacher kicks the front of Gaitano 'Guy' Russo's car, the airbag deploys. Unless the engine was running, which it would not be if he was attempting to observe them stealthily, the SRS circuitry would be disabled.
10:40: Although the caption reads Williamsburg Brooklyn, Reacher walks past the Soho Acupuncture store in Manhattan.
The titles say "Williamsburg Brooklyn" before Reachers lunch. The restaurant "Eds Lobster Shack" shows up on a street shot, which is actually in SOHO.