Problem with Chapter 7 of Development Essentials

First off I just want to say , this is by far the best book for learning unity it helped me understand a great deal and even thou I did run into some problems time to time I was able to work them out.

everything was going fine until I added the script for setting fire.
Whats happening is the GUI texthint is up at the start and through out the game play once I reach the door the text flickers and seems to over ride the door texthint but doesn't over ride the platform texthint.
once inside the outpost the matchbox nolonger shows up on the screen , and when I exit the fire is already lit.




function OnControllerColliderHit (hit : ControllerColliderHit) {
if (hit . collider . gameObject == GameObject . Find ("campfire")) {
}
if (haveMatches) {
haveMatches = false;
lightFire();
} else {
TextHints . textOn=true;
TextHints . message = "I'll need some matches to light this camp fire..";
}
var crosshairObj : GameObject = GameObject . Find ("Crosshair");
var crosshair : GUITexture = crosshairObj .
GetComponent ( GUITexture );
if ( hit.collider == GameObject . Find ("mat") . collider) {
CoconutThrow . canThrow=true;
crosshair . enabled = true;
TextHints.textOn = true ;
TextHints . message = " Knock down all 3 at once to win a battery!";
GameObject . Find ("TextHint GUI") . transform.position.y = 0.2;
}
else{
CoconutThrow . canThrow=false;
crosshair . enabled = false ;
GameObject . Find ("TextHint GUI") . transform . position .y = 0.5;
}
}


function Door ( aClip : AudioClip, openCheck : boolean, animName : String, thisDoor : GameObject){
audio . PlayOneShot (aClip);
doorIsOpen = openCheck;

thisDoor . transform . parent . animation . Play (animName);
}
function OnTriggerEnter ( collisionInfo : Collider ) {

if ( collisionInfo . gameObject . tag == "battery") {
BatteryCollect . charge++;
audio . PlayOneShot ( batteryCollect);
Destroy ( collisionInfo . gameObject);
}
if (collisionInfo.gameObject.name == "matchbox") {
Destroy ( collisionInfo.gameObject);
haveMatches=true;
audio.PlayOneShot (batteryCollect);
var matchGUIobj : GameObject = Instantiate (matchGUI, Vector3 (0.15,0.1,0) ,transform.rotation);
matchGUIobj.name = "matchGUI";
}
}
function lightFire(){
var campfire : GameObject = GameObject . Find("campfire");
var campSound : AudioSource = campfire . GetComponent (AudioSource);
campSound . Play();

var flames : GameObject = GameObject . Find ("FireSystem");
var flameEmitter : ParticleEmitter = flames . GetComponent ( ParticleEmitter);
flameEmitter . emit = true;

var smoke : GameObject = GameObject . Find ("SmokeSystem");
var smokeEmitter : ParticleEmitter = smoke . GetComponent (ParticleEmitter);
smokeEmitter . emit = true;
Destroy(GameObject . Find ("matchGUI"));
}

@script RequireComponent (AudioSource)