In this episode, its been said that Tom's parents ran the camp site since July 30th 1976 but in Cette année là, they began to run it together on July 22nd and the campsite was named differently.
Philippe believes that July 30th 1976 was a Saturday, but it was a Friday.
Although André recognizes Philippe, the latter does not seem to know who he is, assuming he is Ariane's grand dad. This is an error, since in season 10, it s been said that André ran the campsite with Patrick and there was no Philippe here.
There are some errors in this episode, such as Tom who says that his parents had him after Philippe left, making him born in 1976 but in Cette année-là, he says that he was born in 1984.