I liked the gags, too, but what took me out of my suspension of disbelief is that from a practical standpoint the greenscreen window doesn't work. The actors were literally looking at a greenscreen, and the effect is done in post. So unless you've got a really dumb chick, it wouldn't work in real life. That makes me a sad panda.
Um... you've seen some of the women that Barney brings back to his place, right?
I saw a segment on a science show a few months ago about holography - we can actually do a holographic head now (not Kryptonian good, but, it works). link
Albeit, Barney would need to know people and blow a lot of money.