Continuity mistake: At Tony's mom's house, as Gina is following Tony outside, from inside the house the window shade is halfway down, but from the outside it is all the way up.
Continuity mistake: During the shot of Freedom Town there is a resident in a distinctive brown patterned shirt that keeps passing by in the background of the shot with Tony. When Rebinga enters the camp the same person in the brown shirt is entering the camp with Rebinga, only with a pronounced limp.
Continuity mistake: When Shadow is shot, in one shot he's touching his face, but in the very next shot he's touching the detonator on his lap.
Continuity mistake: As Tony chases Hector out of the hotel, a white handbag can be seen behind them on the pavement. Afterwards, once Tony shoots Hector, the bag is gone.
Continuity mistake: When Tony is in the refugee camp and he stabs the communist at the doorway, the camera focuses on the Cuban's face where he is standing upright staring straight ahead. The camera then changes to a rear view and the Cuban is suddenly in a hunched over position making for an awkward transition. (00:11:00)
Answer: It's unlikely a set up. Tony is supplied with money and guns to defend himself. If this was a setup, the toad would've had more details. He would've known Tony had backup with guns and they would've waited to ambush them. Also makes no sense for Omar to put himself at risk without a legitimate opportunity to make cash. Frank knew about the deal as he supplied the buy money. Omar seemed loyal to Frank. Why would he send some low level thugs to be set up losing his boss' money in the process? All he would do is lose trust and be suspected.
Omar was an informant. He wasn't loyal to anyone. Omar's driver is the one that suggested to send Tony to the Colombians. And I think Omar knew the Colombians were shady, and that's why he sent Tony. It was, in a sense, a setup.