to many lights

[Badge]

Friend who shots film was doing a weding and had a variety of problems as about a dozen other people were shooting at the same time as him plus a couple were using video cameras with their aux lights. He had overexposure problems, crazy shadows but the big problems was some bad color. He scans his film, uses adobe elements but it will take him forever to fix the pictures which he gets paid for (not much)
Any ideas other that asking everyone not to take pictures with flashes which would be difficult to enforce

[merock]

Seems like his flash should overpower most other flashes. I could be wrong.