When Peter and aunt May are in the cemetery, aunt May puts flowers in uncle Ben´s grave. It´s the scene where she says something like "it´s all my fault". It´s windy and the leaves are blowing out. As the camera shows her and Peter sideways, you can see the cemetery in the back. The leaves are still blowing out, but in the back there´s no wind! They should not have showed the back. Or should not have used a fan.