SA(and maybe UFO) is the only main game where the Stage 6 Boss isn't the source of the problem. Orin(apperently) caused the evil spirits to show up to get someone to deal with Utsuho-chan.
In PCB, Youmu tries to Master Spark you while your having the Mid-boss conversation with her. "I will drain *Master Spark SFX and line change* every drop of spring from you!" Seriously, that always made me panic, cause I knew the Master Spark sound somewhat off-by-heart.
In PCB, if you wait about 2-3 seconds aftre Youmu declares Deva Realm Sword "Seven Sins" then say the name of the card, you can easily say it in tune with the song. Seven Sins is also a sword attack in [urlhttp://www.rpgfan.com/pics/phantomkingdom/logo.jpg]another video game[/url] that looks alot like a Giant Freaking Laser... Spark anyone? *see above for details*
Most of Mystia's Veiw-reducing spells(IN) are easier then they should be, due to you actually being forced to look at your character, rather then ahead.
A notable number of Yukari's PCB Spellcards are named after Opposites. Life and Death, Motion and Stillness, Humans and Youkai, Light and Darkness, Straight and Curve... thats 5, how many cards does she have in PCB anyway?