* Mao's plan to "rule the world" via job climbing at [=MgRonald's=] seems funny; until you realize; there have been business tycoons who started from the ground up. Part-time employee, full-time employee, manager, corporate executive, management vice-president, management president, corporate executive officer, chairman of the Board. And this is just business; by the time he gets to that level, he'll have learned how Earth society, politics and military works. Maou is an exception to only HumansAdvanceSwiftly; he's LongLived, he's patient. Give him a century or two to himself, and he really would be a rising Power on Earth. (Look at VandalSavage!)
** It makes even more sense after you get to know that he wasn't the overlord forever - he began as a simple trooper in the demonic army and managed to become the overlord the same way he plans to get back now.
** The above idea is also the reason why Maou seems to easily adjust to a simple life, compared to most overlords, who would probably not last a month or two living an impoverished life. He's simply back to his roots, and has not forgotten how he rose to the top.
* The double-deck lunch with a heart design Maou got from Suzuno really was full of love. Or rather, of [[ThePowerOfLove Sacred Power (replenished by love)]] which is harmful to demons.
* In Episode 7, [[spoiler: Lucifer finds Emi's bottle of Holy Vitamin B and jokes that if she keeps drinking stuff like that, she might get a heatstroke like Ashiya. Except, he knew what the bottle actually contained and Alciel had too much of it, thanks to Suzuno. It was a hint that they already knew who Suzuno was.]]
** [[spoiler: And because Lucifer knew what it contained, how else could have Olba known about it?]]

* In episode 6 Mao and co go to an old school building that is apparently a supernatural hotspot, thinking that it might have a link to Ente Isla. Chiho explains that it was closed because several students vanished there without a trace, as if spirited away. [[spoiler: Lucifer]] explains that places where Gates have opened in the past are often subject to supernatural phenomena. If they're right and a Gate did open there, then the missing students were likely pulled to Ente Isla or some other parallel dimension and never found a way to come back.
** If that person was lucky though, falling into another realm is [[TrappedInAnotherWorld how a lot of anime and video games start]].
*** School officials likely wouldn't close the building down if the missing students had turned up unharmed somewhere. In other words, a group of kids wound up in the middle of a TrappedInAnotherWorld adventure in Ente Isla, but ''they never came back'' and never got to see their loved ones on earth again.