At Logan Airport, when George is returning from Cartegena in 1976, at least two passengers have wheeled luggage. Wheeled personal luggage was invented in 1989 by airline pilot Bob Plath, and introduced by Travelpro, which he founded.
When George goes to Puerto Vallarta, Mexico, looking for a marijuana dealer, you can see a Ladatel prepaid telephone card sign in the entrance of a store in the background. The Ladatel prepaid card didn't exist until the late 80's, and the sign is from the late 90's.
In the series of freeze-frame photos following the initial meeting with Pablo Escobar, while the song "Blinded By The Light" plays, at least two bottles of flavor-infused vodkas are shown behind a bar (Absolut Citron and a Stoli Berry flavor). These vodkas were not introduced until the late 1980s.
When they first go to Mexico, a VW Beetle in the background has turn signal lights on the front bumper. VW signal lights were on top of the fenders from the 1940s to the 1970s. The lights moved to the bumpers in the 1980s.
In the numerous airport scenes with Barbara being the courier from LA to Boston, it was late 1968 or early 1969. Automatic sliding doors are shown. Although invented in 1954, they were not commercially installed in airports until the late 1970's.
When George gets busted the last time, his lawyer brings him a pack of Camels. He opens it and sets them to his right. When the lawyer pushes the tape recorder towards him, the Camels are on his left side. When he gets ready to start the player, they're back on his right side.
When George goes to meet Diego to confront him about cutting him out, George pulls the pistol on Diego and dry fires it, producing a click. George then puts the gun to his own head and pulls the trigger for a second time, again producing a click. This would not be possible to do unless George had racked the slide back on the pistol so that it could be fired again.
At Logan Airport, when George returns from Cartegena in 1976, a man in a brown coat with a reddish scarf picks up a bag, then walks through the immigration and customs station behind George without being checked through.
When George and Mirtha are fighting, George's mother, not a crew member, can be seen from the kitchen. She was originally supposed to be in the scene, but the long shots were not used, and her presence seems incongruous.
When George and Barb are walking on the beach, there is a large freighter in the background, heading out to sea, with a plume of smoke behind it. Rather than become smaller and smaller as it sails away, it moves sideways, and the smoke does not move in relation to the ship. This is because it is a picture being moved sideways to simulate an ocean./ It's a real ship. The camera is being panned to the left to follow the actors, which makes the ship appear to move right. There is no reason to overlay a ship in the background when it has nothing to do with the story.
Flipped shot: When George is first taken to Colombia to meet Pablo Escobar and the plane is landing in the background, the Chevy bow-ties on the front of the pickup trucks in the foreground are backwards.
In the scene after George meets Pablo Escobar and his associate is executed, Escobar's henchmen are dragging the "dead" body. However, you can still see the "dead" man isn't actually dead, the man's legs are bent and his feet flat on the ground.