When Gerry falls in the pool is t-shirt is all wet, when he climbs out to grab the Telescopic pole leaf rake, his t-shirt sleeves are dry and the rest of the t-shirt wet. The following scene it shows his t-shirt all wet again.
When Gerry falls in the pool his clothing is all wet. Minutes later when he rescues his family and the police arrives, he is talking to the the detective, and the same clothes that he was wearing are all dry.