The male witness in the intro of the episode opens the trunk of the vehicle by reaching into the front passenger window down near the passenger seat. The trunk release lever is not in that location.
The newspaper being offered by a newsagent in his kiosk (24:06), advertising it as "Lidove noviny" is actually "Nowy dziennik" which is Polish, not Czech newspaper.
Kate Logan identifies herself as being an officer of Europol. Europol doesn't actually have any investigative or enforcement authority, it simply exists to facilitate coordination and the exchange of information between the law enforcement authorities of EU member states, so Logan wouldn't have been authorized to conduct investigations or make arrests in the way that she did. However, although Czech Republic was not yet a member of the EU in 2003 - and, therefore, outside of Europol's jurisdiction - Stabler expressly mentions this to Logan on the hotel staircase and receives the answer that the EU is allowing her to work under their watch.
When Mia is walking through the crowd, the shadow of the boom mic is visible behind her.