Saves versus monster or caster, in particular. As discussed from time to time, the save against a same-level caster doesn't change even if that level is 12 and the spell is first level, because the CL is caster level and the character gets their level as bonus to their save, making levels a wash the same-level matchup; in cases of the save being tied to a secondary attribute the success chance is fairly low (with no stat or other bonus other than level, it's 15%). This isn't the case in AD&D, where saves get easier and caster level or spell level don't matter (in 3.x, of course, casting stat, spell level and special abilities all count).
So, how do you do saves? As written, or with spell level added to CL instead, nothing added to CL, some combination of stuff, what? I guess I've mostly added spell level instead of caster level, although I haven't really settled on anything. I haven't read much Crusader, but hacking this specifically isn't mentioned, as I recall, in the PhB or CKG (although probabilities would be affected by a chance to the target numbers for primary/secondary stats).
So, how do you do saves? As written, or with spell level added to CL instead, nothing added to CL, some combination of stuff, what? I guess I've mostly added spell level instead of caster level, although I haven't really settled on anything. I haven't read much Crusader, but hacking this specifically isn't mentioned, as I recall, in the PhB or CKG (although probabilities would be affected by a chance to the target numbers for primary/secondary stats).