National anthem — The Orioles played the national anthem over the public address system for the first time in recent memory. That didn't stop a small group of fans watching through the fence behind the bullpens from shouting, "O," at the appropriate moment.
Twitter alert — Eaton got some heat on Twitter for a tweet before the game in which he joked, "We're going to try and take the crowd out of the game early." Turns out, they did. The Orioles scored six runs in the first inning.
Human PA system — When Chris Davis and Manny Machado hit home runs in the early innings, MASN play-by-play man Gary Thorne's, "Goodbye, home run," call could be heard clearly in the stadium without amplification.
Full-court press — The curious case of the empty ballpark drew a very large local and national media contingent. The 92 seats in the press box were all taken and they weren't nearly enough. Ironically, on a day when there were no fans in the stands, the press level was standing room only.
Foul-ball cleanup -- There was no system in place to chase down foul balls, but team employees casually gathered them in the area behind home plate throughout the game. Chris Davis’ home run ball sat on Eutaw Street for several innings. The only one that was retrieved quickly was a foul ball that trickled all the way from the upper deck into a MASN camera well down the third-base line.
The actual crowd count — Three. There were two scouts and the pitch-count operator in the lower bowl of the stadium.
The official crowd count — The Orioles were required by MLB rules to announce the paid attendance which, of course, was zero.
In-game entertainment — The Orioles played music over the intercom between innings and the walk-up music for each Orioles hitter, but, of course, they did not put the usual in-game entertainment items up on the video board. No condiment race. No Kiss Cam. No Guess the Year. No birthday greetings. Just a smiling Oriole Bird on the board during each break.
The Knothole Gang — The aforementioned fans who assembled to watch through the fence behind left-center field cheered loudly enough to be heard in the press box. They spelled O-R-I-O-L-E-S several times and chanted "Let's go O's" on a number of occasions.
It was so quiet that... — At one point, someone called across the press box to a co-worker and Orioles center fielder Adam Jones looked up from the on-deck circle and acknowledged him.
The seventh-inning stretch — "Thank God I'm a Country Boy" was played over the PA system as usual. The Orioles did not play "God Bless America," but that's because it is only played at Sunday home games.
The cost — It's impossible to determine how many fans would have shown up for the regularly scheduled night game, but if the Orioles had drawn 25,000 — a reasonable estimate — and the average ticket price is just under $25, the club lost more than $600,000 in gate revenue and probably close to that in concessions and parking.