Grammarly
Grammarly Handbook: Faulty Parallelism in Comparisons Using Than
This page focuses on correcting mistakes in parallel structure when using the word "than" in a comparison. It also covers how to correct the parallelism.
Grammar Tips
Grammar Tips: Faulty Parallelism in Coordinate Elements: Short Version
This resource presents many examples of awkward and faulty parallelism which could be used for a class writing exercise, as well as for a guide to constructing correct sentences.