Greg Baldwin could be a worthy successor to Mako as he has been praised for accurately replicating Mako's voice in other roles such as Iroh in Avatar: The Last Airbender. Baldwin has already voiced Aku once in in Cartoon Network Universe: FusionFall.
Some of the early promos had narration from the voice of Frylock
For the Venezuelan dub, the same team that dubbed Medabots dubbed this. Particularly notorious in the episode Jack's Sandals, what with the shoe salesman being a referee, and the kids having the voice of the kids of the cast.
In a meta example, a lot of the sound effects are taken from Dexter's Laboratory. It's really noticeable.
Recycled Script: Most episodes are either about Jack attempting to find a way home, Aku sending a new assassain to kill Jack or finding a way to do it himself, or Jack finding some group of people oppressed by Aku's regime and helping to free them. It works in this case since the show really is more about fight sequences and strategy than storyline. And toward the end of the show, episode plots started to branch out more, with some new twists on ones that were already established.
Aku: Oh, put that thing away, Samurai. We all know what's going to happen. You'll swing your sword, I'll fly away, and probably say something like, "I'll be back, Samurai!" And then I'll flutter over the horizon and we probably won't see each for... about a week. And then we'll do the same thing again.
Jack: Your word play will not trick me, villain! (Charges)
Aku:(Transforms into a bat, floating away) I'll be back again, Samurai! You'll see! MWAHAHAHAHA!(Reappears) See what I mean?
Screwed by the Network: When Samurai Jack was announced to making its return to Toonami, its timeslot wasn't revealed until a couple weeks before it actually returned, when it was revealed that it would air... at 4:00 AM. Granted, Samurai Jack is an old show at this point, but considering that 1) Samurai Jack hasn't aired on Toonami for about 6 years, 2) it was replacing FLCL (a show that is older than Samurai Jack, has been rerun into the ground on [adult swim] Action... and was airing at 2:30 AM despite these), and 3) 4:00 AM is the deadest hour of the night and is usually reserved for rerunning shows, it's still very disappointing.
However, it did occasionally air on Boomerang Network at an earlier slot, but was often overlooked because that is not a basic cable channel. Toonami has a more prevalent reputation because it airs on a basic network channel seen by a more mainstream audience. Ironically, the later time may work in its favor. And this is nothing compared to the time it was dropped flat on its behind when Toonami was cancelled back in '08!
Sequel Gap: The show got axed in 2004. Now in 2013 the series is finally getting a continuation through a new comic series published by IDW.