Question: How do the three Mexicans get into Llewyn's room right after Anton kills them?
Answer:Anton kills them in Llewelyn's room. The Mexicans were waiting for Llewelyn to return to his room (138) but he saw their truck and the curtains open so went to another motel, then returns and books another room (38) in the original motel so he can get the money from the vent. Anton enters the room to get the money (and kill Llewelyn if he's there), but finds the Mexicans there so he kills them, by which time Llewelyn has retrieved the money and escaped.
Answer: Anton kills them in Llewelyn's room. The Mexicans were waiting for Llewelyn to return to his room (138) but he saw their truck and the curtains open so went to another motel, then returns and books another room (38) in the original motel so he can get the money from the vent. Anton enters the room to get the money (and kill Llewelyn if he's there), but finds the Mexicans there so he kills them, by which time Llewelyn has retrieved the money and escaped.
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