From your notes, two 20 mcg doses of an LSD analog likely shifted the viewing from a subtle nudge to a clear low-dose effect. That can make colors look richer, music more absorbing, and emotions feel more intense, which fits what you experienced.
Low doses often heighten salience and pattern-finding, so themes about nature, responsibility, and social critique can feel more immediate and connected. Feeling like messages are more intentional or urgent is common at this level.
Non-drug factors may have added to it too: first-time viewing versus a compressed trailer, theater sound and projection, and your expectations. I cannot verify the specific analog or its potency, so responses will vary.
For more context on animated films people find vivid in altered states, see this short Q&A: Pixar movies to watch on shrooms. Enjoy the reflection.