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Also, the data could drop low on the 31st because not all months have 31 days so when tickets are distributed evenly over months, that day does not easily match up with 28 (being the definite last day of a month)...then 29, 30 and finally 31 being the least used.

Could this be true?

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That was actually compensated for in the "Correcting for more frequent dates" section. The first graph of that section shows what you would expect the distribution to look like, since not all months have the same number of days.

The following graphs are based on variation from that expectation.

But the analysis did not account for the variable number of weekend/weekday days on each day of the month. I don't know how meaningful this is, but it would be worth it to inspect this separately and then weigh it in if needed.

Just from a brief look at a calendar for 2011 and 2010, it seems like the days were pretty evenly spread out over the week.

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