Factual error: 104 Rue du Jardin does not exist in Paris. They stop on a rather large street which would be called a "boulevard" in Paris. Not a "rue." (00:37:05)
Continuity mistake: In the scene where Jason and Marie go to Jason's residence in Paris, Jason picks up a Bic Pen to write while he's talking on the phone to the hotel. He takes the cap off and places it on the back of the pen. In the next shot, the cap is missing from the back of the pen. (00:39:15)
Plot hole: In Paris, why does the assassin go to the ridiculous amount of trouble of swinging into the room on a rope with a machine gun when he came in from the lobby (as proved by the dead woman downstairs)? Alternatively, if his intention was always to surprise Bourne by coming in through the window, why venture downstairs at all? (00:44:07)
Audio problem: When the first assassin runs out of bullets shortly after coming through the apartment window, his gun makes a series of rapid clicks as if dry firing full-auto, but real guns, even full-auto ones, don't keep on clicking when empty. It should either make a single click, or a nearly inaudible one. (00:44:16)
Continuity mistake: When Jason enters the train station to stash the red bag, the large clock on the outside of the station reads exactly 12 noon. Once he's inside the station the clock reads after two. (00:48:37)
Revealing mistake: Just as Jason is returning to the car from the train station after dumping the bag in a locker, spectators can be seen watching the filming, which was apparently done on the sly and without consent. Nonetheless, the onlookers did notice the film shoot and followed the actors' actions, who are not doing anything in the scene to draw attention to themselves. Watch the black man to the left of Jason in the background, he follows the scene and his head turns as he watches. Then look behind Marie right after that and there are 2 or 3 people watching as well, in the background. This is very visible and very distracting. (00:50:50)
Continuity mistake: During the car chase there is a shot of Bourne steering frantically. In the centre of the steering wheel is a Mini badge. Cut back a few moments later and the badge has changed to a Cooper badge. (00:51:15 - 00:52:05)
Continuity mistake: When Jason and Marie are in the car prior to the car chase they have a conversation with camera angles switching back and forth in the car. From shot to shot the window glass is alternately covered with a lot of rain droplets, a few rain droplets, and even completely dry. (00:52:15)
Continuity mistake: In the car chase scene, the windscreen wipers on the Mini change from being on, then to off, then back on again throughout the whole chase. (00:52:42)
Visible crew/equipment: Right at the end of the car chase, the yellow van in the pile-up is flipped over by some kind of large metal lever in the undercarriage. This is seen from the last 2 angles of the crash. (00:52:45)
Revealing mistake: During the Paris car chase scene a van gets knocked over - if you look in the van there is no-one in it. (00:52:45)
Continuity mistake: At the beginning of the car chase, the red car has a burnt out leftside tail light. For the remainder of the chase, it's working. (00:52:57)
Continuity mistake: After the car chase in Paris, Bourne parks Marie's car in a garage but when the cops find it later it's not the same garage. The wall in front of the car is different and the concrete column with the extinguisher is gone. (00:56:20 - 01:07:50)
Continuity mistake: When Jason is cutting Marie's hair in the hotel room, his watch is on his left wrist. When he and Marie begin to kiss, in this flipped shot Jason's watch is on his right wrist, his moles have changed sides, and the hand-held showerhead behind them is backwards as well. Next shot his watch is back on his left wrist. The flipped shot has nothing to do with the small bathroom mirror. (01:00:56)
Factual error: When Jason asks Marie for the pay phone number in front of the Hotel Regina, she gives him a 7-digit number, 616 2468. A French phone number would be 8 digits, not including the (0)1 prefix. (01:01:35)
Continuity mistake: When Wombosi is assassinated by the other agent he is shown walking down the stairs with glasses on and a turtleneck sweater. He also has another man following him. Then the next shot shows Wombosi (or a stuntman) standing in front of the window with a leather coat on and no glasses. He is obviously not walking anymore and the man behind him is nowhere to be seen. (01:03:41)
Continuity mistake: When Wombosi gets assassinated, the shot changes to a view of the sniper's scope. The glass on the window is not broken, even after a bullet was fired through it. (01:03:44)
Other mistake: In the scene where Nicole is listening to the French police radio, all rack equipment to her right is from Behringer, which is about the cheapest and most unprofessional you can find. A no-budget-limit governmental assassination squad would not save the $300 and buy Behringer equipment. Period. Also, the bass synthesizer, echo/reverb effects and digital crossovers in the rack have nothing to do there in the first place. (01:08:05)
Continuity mistake: In the scene where Jason steals a grey Ford Sierra, when Marie walks from the phone booth to the car (Jason is taping the window) she passes a red Ford Fiesta and there is a grey Renault Laguna behind it. The car they are stealing is out of shot. When they drive off their car is suddenly on the spot where the Renault was. (01:18:07)
Factual error: When his team are tracking Marie, Conklin asks about the yellow pin in the map and is told she lived there in 1997 and that the nearest town is Riom. The pin is on the town of Nevers which is 170 km from Riom, with several towns much closer than that. (01:22:10)
Chosen answer: They are octopii hung up to dry in the sun. A common sight at Greek islands. If you search Google, there are pictures of them. They are humorously mentioned at http://www.thevisualrecord.com/dbphotopages/photopage.php?photo_id=80.