Corrected entry: The first time Loki looks through the mask, there is nothing printed on the back. But later on, when Loki looks at the back of the mask, "Made in Taiwan" is printed on the back.
Corrected entry: When Odin is summoned and is screaming to Loki and Tim is telling him to love his son, you can see the microphone and part of the crew. (At the end).
Correction: There is no microphone or crew seen at the end, I've seen the movie a couple of times after reading your submission and didn't see any of those.
Corrected entry: In the first film, it was established that Loki was a night god who was banished into the mask, which explained why it could only work at night. Yet, in this film, Loki isn't in the mask and it has its own powers.
Correction: In the first movie Dr Neuman tells Stanley Ipkis that Loki was banished, but it was Stanley who came up with the theory that he *could* have being banished into the mask. Stanley's theory was never proven and it's quite likely he was wrong.
Correction: When Loki has the mask it originally is the real mask. The "made in Taiwan" mask is a fake and he throws it away, realising this.