When Judy is putting flowers into the vase she puts one in, then the camera changes to Jen and when it changes back to Judy she puts the flower into the same vase again.
She fills a vase and when the camera is on Jen, Judy places it to her right and starts filling another vase. You can see the number of filled vases grow by one.
When Judy is talking to detective Pérez, she says she needs to go get those paper bags that are blowing away so seals don't choke on them. However, you can clearly see that they are plastic bags, not paper.