When Liz is handcuffed to the banister, her hair bangs change.
When Tom goes to walk the dog it is no longer the large breed golden retriever seen previously, it's a medium sized dog of a different breed.
Fingers Pavlovich is supposed to be Serbian, but is heard speaking Macedonian, not Serbian.
Towards the end of the episode Reddington calls Elizabeth "Lilly" and not "Lizzy".
The view identified as "Kraljevo, Serbia" is actually Prague, Czech Republic, a city almost 20 times larger than Kraljevo (pop. 67,000).
Analyzing the remains of the escape helicopter is a completely obvious and routine move. The FBi does not need Reddington't tip to get that idea. Also repainting it and changing the tail number cannot conceal the aircraft's identity once its wreck is being analyzed because many if not most aircraft components are serialized and easily traced back.