In the preparation for the running of the bulls, while the bulls are being driven down the chute to the holding pen, a handler behind the safety walls has his shirt change color from blue to white and back again during the same sequence.
When Jake and Brett ride in the cab in 1922 Paris, cars from the 1940s and 50s can be seen through the cab's rear window.
This movie takes great care to copy the women's fashions of the 1920s. The outfits of the men, on the other hand, look very 1950s; even the Spanish military uniforms at the Pamplona sequence are not quite right for the 1920s.