The thing he's missing on a couple of the mixes is phrasing. In a world of sync buttons (and I'm not saying he's using it or not) getting the bpm of two songs lined up really isn't challenging. But knowing your music well enough to know the chorus length and your intros to know where you should drop the next track is important to keeping a clean sound.
I didn't listen to all of it, but coming out of Danza Kuduro he lets two bars of vocals after the chorus play as he mixes in. That's the stuff that will really clean this up moving forward to make sure all of those phrasing types of issues are tighter.
im glad to have learned to mix by ear years ago... ive noticed that some of my songs load in at the wrong bpm... im sure there is a way to fix them...but i pretty much know the bpms without needing rekordbox to tell me... but im sure the sync button would have me all kinds of screwed up if i used it...with these songs being the wrong bpm....
cc