The play's conclusion echoes the end of Act I. Even the stage directions reflect this similarity: after boy's exit and the moonrise, the stage directions read, "as in Act I, Vladimir stands motionless and bowed." While a live audience would not read these directions, they serve to emphasize the parallel between the two acts for readers and for actors performing the play.
The repetition of the final two lines from the previous act at the play's conclusion shows the continued importance of repetition and parallelism in Waiting for Godot. However, the characters have switched lines from the previous act, suggesting that ultimately, despite their differences, Vladimir and Estragon are really interchangeable after all.