Next time you need to separate your purchases into 2 transaction to double the return! You didn't need much more to get to the $100 mark 
That's mildly troubling BUT they all have in their terms and conditions that they have the right to do that. HOWEVER, I would more than likely be starting an online chat to ask AM for an explaination
Christmas in July isn't supposed to post till Nov 25th but I would be surprised if they don't post them soon to clear up that mess before Shop the Block starts soon. Mind you, the last time they had a special promo that was entirely based on the online shopping it was a complete 
storm when it came to the posting, hardly any of us had it work properly. I'm expecting this to be very similar, i still have one transaction that didn't post. I don't remember what the other promo in the summer was called because we chose not to do it, wasn't' worth the outlay of cash to us if i remember correctly.
Shop the Block: we should be getting some hints of it soon-ish, it has historically started mid-November. There has always been online shopping involved AND when it comes to Amazon I have found that if I mix up my transaction it triggers miles for the entire amount even if some of the "excluded" items are mixed in so I'd think it's worth trying. Not sure what your question about Indigo is other than I know you earn points for gift cards as well as everything else they sell.
I'm not sure why you only used one of the coupons? I included both in my post, be sure to check next time that you are fully armed when you head out, gotta max those miles whenever we can!!
If you have had miles posted and the amount is not what you are expecting I would go ahead and contact AM now. I've had that happen a few times and they are pretty good about correcting it at that point. UNLESS what you're talking about is only base miles posted and not the bonus, then you run the risk of getting the company line of "wait for 120 days"
I've had miles post occasionally with that wording and it's been connected to a bonus offer that came from using my AMEX card. Did you take part in the recent Mastercard offer? Maybe it's from that? The Flu shot miles posted about 2 - 3 weeks after the email came out saying the shots were available -- it's later than normal this year because there was a shortage of the vaccinne so I'm expecting it to post *soonish* the notation will look like this when it does finally show up
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So this past weekend I bought a $200 e-gift card from Indigo through airmileshop, thanks for the idea

. Airmiles posted:
9 base miles ( should be 10 - 1/$20),
36 bonus miles from a 5x multiplier from Indigo
81 bonus miles from the 10x Halloween multiplier
I then used the e-card and spend $181 pre tax. Airmiles posted:
8 base miles (correct)
32 bonus miles from the same 5x multiplier
72 bonus miles from the 10x Halloween multiplier
They seem to subtract a base mile and then use the multiplier, I think. It just seems like wonky numbers considering that I thought it should be pretty straight forward. Has anyone else run into this?