Criticisms of Einstein's Theory about the Special Theory of Relativity Published in the Annalen Der Physik in 1905

Since I have been trying to understand Einstein's work for more than 10 years, without success, I have chosen the two points below where in my opinion there are some inconsistencies, and I ask if any person with great skills in mathematics and/or or physics, can point out to me where I make mistakes in the interpretation of Einstein's text. I am offering a small prize of 2,000 swiss francs (1,000 for each of the two questions) for anyone who is able to explain in an understandable way even to me, which mistakes I have made. I'm only interested in knowing where I went wrong.