Rick is an American who is played by Canadian actor Brenden Fraser.
Jonathan Hyde (Dr. Allen Chamberlain) is British. Though it is possible he is a Brit the Americans have hired.
Fake Brit: Well, sorta... John Hannah is Scottish, but plays an English man.
Played straight by Maria Bello in the 3rd film.
Fake Mixed Race: Evelyn and her brother Jonathan both have an Egyptian mother and an English father, but are played by native British actors.
Fake Nationality: Almost nothing but Fake Nationalities. Rachel Weisz really is English, Jet Li actually was born in China, and all the 'American cowboys' are played by Americans, but nobody who played an Egyptian character was actually Egyptian, or even Arab or African. Oded Fehr is Israeli, Arnold Vosloo is South African, Patricia Velasquez is Venezuelan, and Dwayne Johnson is an American—of Samoan and African heritage, mind you. O'Connell's actor is Canadian American, Jonathan's is Scottish, Beni (who is supposed to be Hungarian) is played by an Irish-American guy from Chicago. From the third movie we have Maria Bello (American), Michelle Yeoh (Malaysian) and Russel Wong (American). Moreover, Evy and Jonathan's mother was supposedly Egyptian, but neither actor is of Egyptian, or even middle-eastern, descent.
The Scorpion King is Dwayne Johnson, an American, playing an Egyptian warrior.
Older Than They Think: Many seem to believe that the idea of a mummy actually coming to life and magically attacking people is just a modern Western reaction to the exotic burial traditions of the long-gone ancient Egyptian culture. In fact, Egyptian mythology itself contains numerous tales of such occurrences being witnessed by their own people. Perhaps the most famous story is that of a prince who sought a magical artifact (the Book of Thoth) known to be entombed with a long-dead prince. Upon breaking into the tomb the live prince is confronted by the ghost of the tomb owner's widow, who begs him not to take the book as it bought their own family nothing but misfortune. When the live prince doesn't heed the warning, the mummy of the dead prince rises out of his sarcophagus and casts a spell that causes the tomb's solid stone floor to swallow the live prince up like quicksand.
The Other Darrin: In the first two films Evy is played by Rachel Weisz. In the third film, she's played by Maria Bello because Weisz didn't want to play a character old enough to have an adult son.
Playing Against Type: Rachel Weisz tends to play very sly and knowing women - she's even been known to play The Vamp - but here she plays a very nerdy librarian who obviously hasn't had a lot of experience with men.
Originally the opening of the first film was going to be narrated by Imhotep himself - but then Stephen Sommers remembered that Imhotep wouldn't have any reason to speak English, and the audience probably wouldn't want to sit through a voice-over that needed subtitles; thus the introduction was given to Ardeth Bay instead.