Revealing mistake: When Diane and Patti chat next to the spider, Patti stretches out her arm to move the (blue-screened) spider web away, but she is missing the spot by two metres.
Suggested correction: No, Patti is not meant to be moving the spider web away in that shot; she is simply reaching for the web so she can cut it with the nail file and free the daddy longlegs. Then, the shot changes before we see her touch it. After two shots of Patti off-screen, we then see her cutting the web. Plus, that screenshot does not convey the "problem."
Continuity mistake: When the two couples are riding in the toy car going down the track, the car alternates from (not) having a roof between shots.