Continuity

When MacLeod arrives in New York City, he is seen walking down Broadway and the streets and sidewalks are clean. Then he turns into a side street and it is ankle-deep in snow.

‘Revealing’ mistakes

When McLeod is back in his antique shop, saying "Welcome back, McLeod", a silhouette of a crew member is visible in lower right.

Crew or equipment visable

Dolly tracks visible when Conor is in the Psycho ward.

Others……………

"Bienvenue à Montréal" ("Welcome to Montreal") sign in an airport supposedly in Newark

When Connor's sword is shattered by Kane's sword, it shatters all the way down to the tsuba, or guard. In subsequent scenes with Connor holding the broken sword, the blade extends 2-3 inches out from the tsuba.

US Navy Submarine Service insignia pin (Dolphins) on Japanese security guard's hat.