When Von Braun is talking to the Rotarian Club he draws a diagram on the blackboard with four lines coming out from the central body. When the shot cuts to the reporter and back there are only three lines. When it cuts to the reporter and back again there are four lines again.
The American jeep used in the first half of E1 while looking for the V2's is a Korean era Willys M38, as identified by the larger 'bug-eyed' headlamps. The correct vehicle would be a Willys MB or Ford GPW.
The US soldier who "captures" Huzel carries an SKS-45, which wasn't put into production until 1949.