Early in the opening sequence, library footage of a jet airliner with tail mounted engines is shown, purporting to be a USAF bomber. No US bomber of the time had such an engine configuration.
The opening sequence shows what is implied to be the interior view of a US bomber. In fact its the interior of a British RAF Vickers Valiant bomber.
Cliff is kissing Viviane Ventura under an archway. One of the Shadows jokingly says that they could arrested for that. The local Spanish urchins then run away laughing. Assuming they even speak enough English to understand the comment they can't possibly see the kissing as they are all far round a corner, 90 degrees from the kissing action.
When Cliff grabs the hands of the girl in a pink dress in the hotel when the camera angle changes he does it for a second time.