Do I understand you to be saying that Calvin felt free to teach error in his devotional material???? Seems quite odd to me.
By the way, Waite is esteemed. ThD AND PhD. I don't have those. Do you? (Ignore this if your words weren't intended to be sarcastic.)
No, there is no error in Calvin's Commentaries. However, they serve a different purpose than the Institutes, which is something that Dr. Waite doesn't seem to understand.
I will give you a personal example: When I share the Gospel, I never use the words "predestine", "atonement", "propitiation", etc. I share the Word of God with men, and plead with them to come to Christ in faith. Even though I know that they will not come unless the Father draws them, I do not know who He is drawing. I simply plead with them to come, knowing that their positive response will be in response to His election and calling. However, once that man is saved, as part of my discipleship training of that man I will show him the nature of the work of God that saved him. Does this make sense?