I just purchased a Cabelas 4.1 Outfitter Cam by Moultrie. So far I'm getting dozens of pictures of the feeder without any wildlife in view. I read that this can be caused by the heat...it's been in the 90's just about every day.

Is there a trick to get it to only trigger when it should?

By the way, it has taken a few good pictures...

make sure its facing north or south or try putting it in the shade.

if it is faceing the sun that can trigger it

Ditto

also a fast moving deer or other animal can trigger it and yet you won't get a pic.

Thats the deal I had with my first cam (moultrie)
Try this set the cam up and about 10-15 ft in front of it walk by starting out fast and geting slower each pass.
I dont think you will be very pleased with the trigger speed= Time camera wakes up and snaps a picture.
See the picture if this deer was 4 ft closer it would take a super fast trigger time to catch him as he's hauling but. this cam has around 1-1.2 second trigger.