CONCORD, CALIF.—The owner of a California movie theatre is apologizing after a trailer for an R-rated upcoming Seth Rogen comedy was shown ahead of a screening of Disney’s “Finding Dory.”

The East Bay Times reports moviegoers eager to see the PG-rated “Finding Dory” at a Brenden theatre in the Bay Area city of Concord were surprised earlier this month with a preview of Rogen’s “Sausage Party,” an animated film with dark themes about what happens to food after it’s taken home from the supermarket.

Brenden vice-president Walter Eichinger tells the newspaper it was a one-time mishap due to the theatre “moving screens around in effort to accommodate several large last-minute groups wanting to see ‘Dory.’” He says the wrong movie was started by mistake and insists it won’t happen again.