The day following, when the people which stood on the other side of the sea saw that there was none other boat there, save that one whereinto his disciples were entered, and that Jesus went not with his disciples into the boat, but that his disciples were gone away alone; The day following - that is, the day after the miracle of the loaves and the stormy night, or the day on which Jesus and His disciples landed at Capernaum.
When the people - `the multitude' х ho (G3588) ochlos (G3793)].
Which stood on the other side of the sea - not the whole multitude that had been fed, but only such of them as remained over night about the shore, that is, on the east side of the lake; because we are supposed to have come, with Jesus and His disciples in the ship, to the west side, to Capernaum.
Saw that there was none other boat there, save that one whereinto his disciples were entered ... but that his disciples were gone away alone. The meaning is, the people had observed that there had been only one boat on the East side where they were, namely, the one in which the disciples had crossed at night to the other, the West side, and they had also observed that Jesus had not gone on board that boat, but His disciples had put off without Him.