This information is not shown in the current version of Pocket Earth. Our next update will include a speed & altitude vs. time graph which will show visually the change in speed and altitude over the course of the recording.
We do support a notion of Track Markers which do show you this info at a specific point on the track. Currently, however, you can only create these live as you are recording (it adds a marker at the current location of the track). Perhaps it would be useful to allow creation of such markers anytime and allow them to be dragged along the track to see the info at different moments.