S4: Ep.20 Mouse & Sammy are up to mischief again. They've found an audio cassette recorder and decide to have fun with it:
Sammy   Nothing works round here. Have you got it switched on? R
Mouse   D'you think I'm daft?  
Mouse presses <REWIND> then <PLAY>. They
listen to their previous conversation
<<
P
       
Mouse   Yesssss!!  
Mouse presses <STOP> then <REWIND> <<
Mouse   Do you wanna hear what kissing sounds like? --
Mouse presses <RECORD> R
And they leave the recorder running under Pride's bed.
Pride discovers the tape recorder under his bed long before they start kissing. Pride rewinds and plays the start of the tape:
Sammy   Nothing works round here. Have you got it switched on? P
Mouse   D'you think I'm daft?  
<CLICK>  
Mouse   Yesssss!! Do you wanna hear what kissing sounds like?  
 
The Goofs: There are two, both rather technical and Geeky, and similar, but they show that the scriptwriter just didn't think it through.
 
Goof #1: When Pride plays back the tape, the <CLICK> we all hear is when Mouse pressed the <REWIND> button. Mouse exclaimed Yessss!! while the recorder was still playing back. So it couldn't have recorded her.

Goof #2: This supersedes Goof#1. So we have a 2-layered goof!
 
2a: We hear Mouse say Do you wanna hear what kissing sounds like? But when Mouse said this, she had stopped the recorder, and rewound the tape back to the beginning. She had not yet pressed <RECORD>
 
2b: When Mouse pressed the <RECORD> button, she had rewound the tape back to the beginning. She and Sammy then left the machine running without saying anything further. So all of Mouse & Sammy's previous conversation would have been wiped, and Pride would have heard a blank tape.