They had the t-shirt cannon at US Nationals in Nashville. I hope the days of high fiving skaters are not gone forever.Thank you for the update, @CoyoteChris, and the days of high-fiving skaters are sadly long gone (can't say I miss the T-Shirt cannon )
One thing you mentioned and I'm glad you did, I thought it was just me: vision during some of the lighting. I was actually seeing double, I had to shut one of my eyes during parts of the group numbers (I wasn't missing one second of Jason, but I knew there wasn't two of him ).
I did think however, that "show lighting" was great for some of the individual programs. By then my eyes were accustomed to it.