Many of you left comments showing that you've been paying attention; well done! For those who might have missed my previous discussion on the topic of similar-sounding callsigns, here's a quick synopsis:
Both of these pairs of strips have aircraft with similar callsigns and the same proposed departure time. I noticed these because I happened to work all four of these aircraft. As it so happened, each pair that I showed you arrived at the runway just in the order you saw them: EVA was right behind Delta, and (on a different day), Deltas 1554 and 1654 were one-behind-the-other on the taxiway. As you have a right to expect, your brilliant and dedicated LAX ATC handled the situation with grace, style, and aplomb.