Revealing mistake: If you look at the river under the bridge and all other shoots it isn't flowing yet it is quite shallow. In one shot the wind is blowing the surface.The river was purpose built along with the town on former British Aerospace Factory in Hatfield Herts and the river is a shallow oblong mini lake the runs the width of the set.

Saving Private Ryan (1998)
21 revealing mistakes - chronological order
Directed by: Steven Spielberg
Starring: Tom Hanks, Matt Damon, Vin Diesel, Giovanni Ribisi, Tom Sizemore, Barry Pepper, Edward Burns, Adam Goldberg

Revealing mistake: When Wade gets shot, watch the shot where Upham brings the bags up to the injured medic. The next shot there is some fog which then reveals the injured medic. In this shot, watch carefully as the cast rips away the medic's shirt. If you look near the neck, you can see the fake stomach vest he is wearing for a split second - when the actor realises he ripped too far up, he quickly covers it back up. (01:28:43)
Private Jackson: What I mean by that, sir, is if you was to put me and this here sniper rifle anywhere up to and including one mile from Adolf Hitler... With a clean line of sight... Pack your bags, fellas. War's over. Amen.
Trivia: The pivotal role of "Minnesota Ryan", the Private Ryan that Captain Miller mistakes for the Private Ryan for whom he is searching, is played by a very young and, at the time quasi-unknown, Nathan Fillion.
Question: After Capt Miller gets briefed on his new mission to rescue Pvt Ryan and enlists Upham for the mission, there is a long shot of the beach. What are those Zeppelin-like things that are floating around, tied to the ground? What are they good for? (00:39:50)
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Answer: These were barrage balloons, commonly used during the war. They are used to stop low level bombing and low level fly bys by enemy fighter planes. The cables attached to the balloons are designed to cut through the wings of the aircraft and to bring them down, so any pilot would have to fly above them, and the balloons would also restrict the view from above.