Here are some potential problems with the aspect ratio ("Screen Formats") information on various ZIP Details pages. I've pulled the "Original Ratio" and "DVD Ratio" from IMBD database (the numbers are linked to the appropriate tech pages there). I've indicated "Also Fullscreen" where I know there are separate Pan-And-Scan and Widescreen products for sale - having the right info in this case is fairly important. Some may actually be correct at ZIP; there are some odd bits of information out there in this area.
This is a list where the aspect ratio listed in the Details section of the ZIP page seems to be incorrect - most of these seem to have an incorrect value of 1.33.
Some other aspect ratio problems. Some are "Missing" from the ZIP Details page, others just show the phrase "Widescreen" instead of the actual ratio. Others seem to have the aspect ratio show up in the wrong section of the Details page (ie. "Language and Sound").