Should you point out the mistakes?

There has never been a perfect church service. Ever.

In every public meeting of Christians, something goes awry. Even slightly.

You scramble the words of your point.
Your introduction isn't smooth.
Your ending doesn't quite connect the way you hoped.
Things go out of order.
The musicians play a wrong note.
The microphone stops working.
There's a blackout.
The PowerPoint has a typo.
The computer freezes.

I'm sure, if you've been around church services long enough, you'd be able to list a thousand more...

Some of these are, frankly, barely problems.
Many are glanced over and quickly forgotten.
A few wouldn't even be noticed.

But, when there's a noticeable glitch, do you acknowledge it?
Should you?
Do you have to?

A few factors point to the answer...
Is it noticeable?
Can you overcome it easily?
Who was the cause?
Is an apology warranted?

I think, if you're the cause, then it's your call.
If it's your typo, then you can point it out.
If you didn't turn on the hearing loop, then you're the one who should acknowledge the problem.

But, if it isn't personally your fault, with something monumental like a blackout or medical emergency aside, it's best to usually just let it slide.

If need be, you can deal with the issue later.

But, the worst thing you can do is appear to slam the person who goofed.

The musician doesn't need to be reminded that they hit the wrong note.
Or that the bible reader lost their place.
Or that the techie had the slides in the wrong order.

Why?

Because a) we should encourage those being involved in the service b) it might actively discourage others in getting involved and, importantly, c) unless you can do the task, especially music, then you don't really have the right to criticise since you wouldn't be able to do it yourself.

But, there's one exception.

I think you absolutely should mention a glitch if the problem was your fault, but someone else might cop the blame.

If you put the slides in the wrong order, own it. Don't let the techie take the hit.
If you invited the person doing the notices up early, and thus they weren't quite ready yet, own it. It's not their fault.

Church services, or anything we do, won't be completely flawless.

We need to manage the tension of showing people it's ok to let the imperfection drift by and also acknowledging when you've personally stuffed up, quickly apologise, and continue.