These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Secret of Kells
Animation Age Ghetto: Somewhat. It's recommended ages 5 to 7 on Netflix, despite the whole "vikings attacking and murdering an entire village" thing.
Anticlimax Boss: Crom Cruach. Despite being an ancient Celtic god who destroyed Aisling's entire family (and possibly species), it gets about a minute of screen time and is promptly defeated by a piece of chalk.
Mondegreen: What Brendan prays on the stone in the forest. The subtitles say "Oh no, it's hard enough," one can hear it as "I know eternal love," and the DVD Commentary mentions that it's a prayer in Irish, which doesn't make sense with the English subtitles...
It's the opening line of the Lord's Prayer in Irish: "Ár nAthair atá ar neamh...". The subtitles on the UK DVD just say [Prays in Irish].