When Gallagher's bomber is attacked, the close-up is a P-51.
Stock footage is used of P-51s/F-51s with post-war "USAF" markings.
The silhouettes of the P-51s shown on the briefing cards as well as the aircraft shown in flight are incorrect for the time period. The bubble canopy indicates that these are the P-51 'D' variant, which were not introduced in the ETO until mid-1944.