Practice day with No. 11 narrating the show for one. Secondly, they could have planned to switch to a Low Show, but never did. Thirdly, if the narrator was using the wrong script, he would have read the PIR instead of the Arrowhead Loop at that time...
Just some food for thought. That's why they warm up on Fridays!
Thunderbird 8 often does media rides with a local VIP during the practice show (not to watch from the air), but they just happen to take off before the air show and RTB after the demo finishes.
Sunday's weather turned out to be better than expected and it turned out to be a nice little show(especially a great vapor day). One question in particular though, why were there 2 Thunderbird sneak passes? The first was normal because of the trail to diamond roll, but there was another one during the 4-ship trail pass that I failed to notice and didn't catch on the digital. Is the sneak pass during the trail pass normal for a low show? If it is then next time I will be ready.
There are two sneaks in the Low Show and Flat Show, but only one in the High Show. See the link below for which maneuvers they follow: List of Maneuvers
If it is then next time I will be ready. 
Many thanks LD. Yeah, sneak right after the Echelon PIR. 