In the remake released under the title "Hotel Danubio", the mask arrangement in Carlos' room ends with a picture of red fish, most probably as an allusion to the original film. The line when Hugo speaks about the red fish turning around in a fishing bowl was completely omitted, so the picture in Carlos' room is the only reference to the original production. The end is also different in both films, as "Los Peces Rojos" closes with detectives waiting for Hugo at the Police car, while "Hotel Danubio" goes on with a dialog between the two policemen, followed by camera moving to the beach where some men (apparently morning joggers) are seen running along the beach. Then we find out that they were running towards a man who has drowned, and whose corpse lies on the beach. A puzzling ending, for sure.