Yes, actually! There is an extensive list of things that can go wrong, listed under "Mishaps", and with the writing getting progressively more cramped as it tries to squeeze everything onto the available page. Apparently the author kept discovering new ways that things could go wrong.
The different kinds of mishaps cause different deleterious effects to the caster. Some of them sound pretty unpleasant, but none are permanently damaging. There is a warning that the ancients were capable of harming themselves by casting without a source of amethyst present, but the author of the journal was unable to replicate that.
Drawing an invalid glyph will call up a "nonsense" iota that contains no useful information, as does invoking a pattern with too few iotas, as does completely overwhelming the spell-casting with iotas, as does using the wrong type of iota. Trying to affect something that cannot be affected, either because it is immune or because it is too far away, causes whatever is in the caster's hands to violently fly away.
Dividing by zero causes pain, dizziness, nausea, and lingering malaise that recovers slowly. Targeting a thing that exists and can be affected by the spell, but is the wrong kind of thing causes a phantasmal green explosion. Stuffing too many patterns into a single spell-casting causes temporary asphyxiation. Attempting to bind the essence of a sentient being into a magical item causes temporary blindness.
Of course, all of these are only the problems caused by malformed spell-casting attempts. It is perfectly possible to write a well-formed spell that summons an explosion, or teleports the caster into a wall, or destroys whatever one is standing on. Those possibilities aren't explicitly called out in the journal, but perhaps Olivia can read between the lines.
There is another problem with casting "Summon Rain", though — the glyph for that one is incomplete. It has the shape recorded, but not the starting point or stroke direction, so she would have to brute-force possible combinations to try it.
The journal recommends this as the simplest complete spell, which does nothing:
Mind's Reflection, Novice's Gambit
Mind's Reflection brings in an iota representing the caster, and Novice's Gambit silently discards it, bringing the spell to a close.