It looked to me like the Yak-3 had a gear issue. They only retracted about half way up and once the pilot realized this he immediately entered the landing pattern extened that gear and landed.
Speaking of landing, that plane lands HOT!! It was notably faster as it rolled past show center.
Another note on landings. I was the show on Saturday and I saw some of the very best landings anywhere!! You could almost see the tires dragging through the grass blades before actually settling down.
I have to say that the Mosquito is brilliant. There is no way they ever looked that well built new. The fit and finish of the parts and pieces is show car quality.
I thought that they were going to burn the starter on the Corsair up. I bet they cranked that thing for 20+ minutes. You could see the prop speed up as

some cylinders fired, then back to cranking speed.
They did get it running and did a fine job with the show.
I hate that they can't fly down the runway, but I am guessing that the FAA rules dictate that since maybe they cannot fly far enough away from the crowd to maintain the minimum safety area?
I was spoiled by going to the first fund raiser show they had down there. They were raising money for Angel Flight??, the private pilots that fly military families to see their wounded soldiers, sailors, airmen, and Marines. We were basically on the edge of the runway as they flew some of the planes. It made you want to duck we were so close, and they also did aerobatics, but not at ground level.