Cagalli, Fllay and Lacus, the three female leads of the series, only ever exchange 1 line of dialogue to each of the other two throughout the series' 50-episode run.
You're one of us Kira.
Kira Yamato: No! I won't join ZAFT.
After Lacus joins Kira's crew, the later of the two eye-catches is modified to show Lacus and Athrun with a collection of Haros, and different music, instead of the rousing Gundam eye-catch that appears before the break.
In the DVD version of episode 28, entitled "Kira," the last scene has been completely reanimated to better reflect the vision of Gundam Seed director Mitsuo Fukuda.