The Courtship of Betty's Father - S3-E14
Other mistake: When Betty is waiting at Elena's home, Elena walks up carrying a bag filled with groceries, and during their conversation we see the box of Nabisco Thin Crisps and bag of Goya Plantains in the grocery bag. Note the "Nabisco" logo and the brand name have been covered on the box, and there are strips of white tape disguising the brand name "Goya" on the bag. (00:36:10)
