After the lady who buys three cups of lemonade pays Jessica, she closes her purse twice.
Just before Jessica goes and asks the woman with the pram if she'd like some lemonade, we see Nicki put the plastic cups down beside the cash box. In the next shot of Jessica talking to the woman, the cups are on the other side of the table. They're back in their original place in the next shot.
When Karl presents Jessica with the lemonade sachet, he changes from holding it at the top, to the side, then back and forth again.
At 14:04 you can see a pile of American dollar bills in a bin, but the bills are not real US currency and are fake.
Whenever people walk by cars, for example Jessica and Karl after they first meet, crew members are reflected in them.