Director: Roman Polanski
Starring: Catherine Deneuve, cosmological constant
The cosmological constant was completely irrelevant at z>1000, when the acoustic oscillations were created. It therefore doesn't change the shape of the peaks at all - it merely shifts them sideways, since it affects the conversion from the physical scale of the wiggles (in meters) into the angular scale (in degrees, or multipole l). Not that this is analogous to the effect of increasing curvature, but goes in the opposite direction.
In addition to shifting the peaks sideways, a cosmological constant also causes fluctuations in the gravitational field to decrease over time, like spatial curvature in the previous movie. This means that if a photon flies though a potential well on the way to us, its blueshift from falling in will exceed its redshift from climbing out. Since these extra fluctuations in the photon temperature (known as the late ISW effect) happen at late times, they show up on large scales (to the left in the power spectrum).
The effect of Lambda on the galaxy power spectrum (bottom) is also similar to that of Ok: it slides the curve vertically (by slowing the growth of fluctuations) and horizontally (by changing the Hubble parameter h).