I think there can be some “humour” found in the Transfiguration. If you look at what was going on, Jesus tells James, John & Peter he wants to go for a walk to the top of a mountain. So the apostles think it’s probably just like any other walk but Jesus knows what is going to happen at the top. Then after God reveals Him (again) as Son with Whom He is well pleased…Jesus orders them not to tell anyone. So they walk down the mountain and are doing what–how exactly would you hide that from Andrew, Matthew, Thomas, and all the others?
But on a more serious note, I think you can draw a parallel to Jesus carrying His Cross up the Hill at the time of the Crucifixtion. I always like to compare this climbing of the “Transfiguration Hill”, to the Way of the Cross, how different they were–at the Transfiguration Jesus walk is easy, he is supported by his friends and at the top of the mountain His glory & the Glory of God is revealed in a divine way. At Calvary, His glory is revealed in a human, sacrificial way.