The Young Indiana Jones Chronicles were always aired unchronologically, meaning, that one week we could have London, May 1916 and the week after that British East Africa, September 1909. Each episode had a different style, because Lucas brought in about 10 directors, and they all had a different picture of Young Indy in their head. Carl Schultz and Simon Wincer made the action episodes, Deepa Mehta 2 philosophical ones and then of course Terry Jones, who directed the Barcelona one. It's true, that Barcelona may not be everyone's understanding of Indiana Jones, but I thought it was a great episode. It was funny, and silly, yeah, but in my opinion, still realistic, while the second half of "Espionage Escapades", Prague, August 1917, is way to surreal for a Young Indy adventure.
As for Daredevils of the Desert, the extended version of the Palestine episode, I agree. Great casting choices, excellent cinematography etc.