The messages are positive but not deeply explored. There are clear themes of self-empowerment, forgiveness, and acceptance, plus reconciliation and prioritizing family.
Some rude humor. Use of "oh my gosh" and "what the heck."
It doesn't get more product-placement-y than this. The whole movie could be considered an ad for Lego sets, as well as the Ninjago TV series, etc. The Lego brand name is frequently visible.