This is a nice activity to do together. If you get stuck, you can give each other clues about the items you missed.

When each person has turned over their page after looking at it for a while, use a whiteboard to record the items remembered for all to see.
If one or more people in the group are not able to remember very well, ask them to remember just one or two items and then ask them first when it is time to write down or talk about the answers. If they can remember that’s fine, but it’s equally fine if they can’t. Just smile, reassure them that it’s OK, and move on to another person. By not putting too much pressure on a person to remember, they are more likely to participate actively the next time. Once they know that it’s ok to be wrong, or not remember the activity is more fun.
If you get stuck, give more clues as to what the missed items look like.

Do this one together. If you don’t get them all, you can either turn the page over again and spend more time looking at it before adding more items to your sheet or, try to identify which items you missed the first time by comparing what you see to what you have written down.