Faulty Parallelism--missing articles or prepositions; mistaken location of both/either; mixed forms in series;  mixed clause structures

Merely annoying violations of parallelism:

It is a time not for words, but action.

It was both a long ceremony and very tedious.

Mary likes hiking, swimming, and to ride a bicycle.

The teacher said that he was a poor student because he waited until the last minute to study for the exam, completed his lab problems in a careless manner, and his motivation was low.

The coach told the players that they should get a lot of sleep, that they should not eat too much, and to do some warm-up exercises before the game.
 

Genuinely confusing violations of parallelism:

The French, the Italians, Spanish, and Portuguese were among the subjects of his lecture.

I like to eat rich deserts and riddles.