I guess this could go in the "separated at birth" thread (and probably has already), but having just seen Nocturnal Animals for the first time: Amy Adams and Isla Fisher - although here the resemblance was deliberate.
The two I've mixed up on this board are...James Franciscus (Beneath the Planet of the Apes) & Anthony Franciosa (Rio Conchos). They look very much alike & their names are similar.
I think everybody mixed those two up. Likewise actors John Dehner and John Stephenson who both looked and sounded alike. Both acted in the same shows like Hogans Heroes and Perry Mason.
The two I've mixed up on this board are...James Franciscus (Beneath the Planet of the Apes) & Anthony Franciosa (Rio Conchos). They look very much alike & their names are similar.