Easter egg: On the 6th disk, under the "Featurettes" section of the Special features, press to the left and you will see a red "B" highlighted. Press enter to access "The Gift Montage".
Easter egg: On the second DVD from select the episode 'Once More With Feeling.' In the following screen go to the 'Language Selection' and there highlight the menu entry 'English for the hearing-impaired.' Now press the 'Left' arrow key on your remote control and the Buffy 'B' will be highlighted giving you access to 3-minutes worth of footage from the soundtrack signing at Tower Records in Los Angeles. On the fifth disc select the episode 'Normal Again' and then go to the 'Language Selection.' Highlight 'English for the hearing-impaired' and then press the 'Left'. You will now see a sign saying that there is a 'Computer Download' available for the episode call sheet.
Chosen answer: Angel is saying that he is still jealous and Buffy recognizes that this is his way of saying he wishes that they could be together. That is why they both smile.