For the most part this was a great game and penalties made little difference one way or another which is what I like to see. That being said, the pass interference call against the 'Riders (Omar Morgan if I recall correctly) on the Stamps last touchdown drive very nearly cost them the game. It was quite apparent from the replay that there was no interference. My understanding is that penalties can't be challenged but in a case like this that just seems ridiculous. If the hit occurs after the ball arrives it's obviously not interference so why can't you challenge this? If the correct call was made the drive ends (it was second down) and the Stamps don't score a touchdown, and no last minute heroics are required.
To the 'Riders credit they showed a lot of character in coming back with their own touchdown and the defense pretty much shut down the Stamps from there on.