Lighten Up on Flawed Logic?

My monthly book club met tonight.  The book we were discussing was a thriller with an element of time travel.  It was a good book; we all enjoyed it.  But I happened to mention a couple logic flaws in the story and I was told that, because it was sci fi or paranormal or whatever, rules of logic didn't apply.

I have a problem with that.  I've always believed that when an author creates any kind of alternate reality, he/she sets the rules for that reality and then has to write the story to fit inside those rules.  This author didn't.  He violated his own rules several times for plot convenience, with no explanation.

I explained that to the group and was told basically to lighten up.  So there were a few holes in his logic.  What difference did it make? It was still an exciting story.

What difference did it make?  Well, it made a difference to me because a couple hours before the meeting I'd been pounding my head against my desk (ouch!) over a logic issue I'd found in my WIP.  I'd inadvertenlty given my protag an easy source for some information in chapter one that she's not suppose to find until chapter three.   It took me quite a while to come up with a feasible solution and it's going to take re-writing several scenes to fix it.  But why go to the trouble when all these regular mystery readers don't care.  When they all shrugged and asked what difference did it make?

What difference does it make?  As a reader or as a writer, do you think having a few mistakes in logic is okay as long as the story is exciting and fun to read?  How many is too many?  Please weigh in on this one.  I'm really interested.

Favor for a Friend:
Many of you know my buddy, Maria Zannini, is in the running for a  Book Cover Award for The Devil to Pay.  Maria designed the cover herself and it's great.  If you haven't already done so, please take a minute to hop over to this site and give her your vote.  (The voting is on the upper right side of the page.)  I'd really appreciate it.

Personal Note:
I just need to say a couple words here.  Later today I'm going to the memorial service for my daughter in law's mom, Linda Cover.  Linda was a woman of extraordinary courage who faced adversity with style and grace. She was the kind of person the world needs more of and she will be sorely missed.

It seems almost inappropreate to follow that with my usual groaner, but so many of you said you enjoyed Wednesday's and Linda was also a person of laughter so I don't think she'll mind.

Groaner of the Day:
Once upon a time there were two canaries in a cage, one male and one female.

After a few days together, the male decided to meet the female. He scooted over to her side of the cage and said, "Since we're in this together, why don't I move over to your side of the cage!"

The female canary replied, "No, thank you."

The male went back to his side of the cage but after a while decided to try again.  He hopped over to her side of the cage and said, "I am sorry I was so forward before. Why don't we get to know each other first."

To which she replied again, "No, thank you."

Feeling very shot down, he languished about for a bit then made one final effort. "Well, could we at least talk?"

This time she replied, "I'm sorry if I seem mean. But I just learned I have a canarial disease called, "Chirpies" and I'm afraid it's untweetable."

(forgive me)