diff --git a/engines/lab/eventman.cpp b/engines/lab/eventman.cpp
index b1348371b11..f9b3d2f3880 100644
--- a/engines/lab/eventman.cpp
+++ b/engines/lab/eventman.cpp
@@ -78,17 +78,7 @@ Button *EventManager::checkButtonHit(ButtonList *buttonList, Common::Point pos)
 		Common::Rect buttonRect(button->_x, button->_y, button->_x + button->_image->_width - 1, button->_y + button->_image->_height - 1);
 
 		if (buttonRect.contains(pos) && button->_isEnabled) {
-			if (_vm->_isHiRes) {
-				_hitButton = button;
-			} else {
-				button->_altImage->drawImage(button->_x, button->_y);
-
-				for (int i = 0; i < 3; i++)
-					_vm->waitTOF();
-
-				button->_image->drawImage(button->_x, button->_y);
-			}
-
+			_hitButton = button;
 			return button;
 		}
 	}
@@ -156,7 +146,7 @@ void EventManager::processInput() {
 		switch (event.type) {
 		case Common::EVENT_LBUTTONDOWN:
 			if (_screenButtonList)
-				curButton = checkButtonHit(_screenButtonList, _vm->_isHiRes ? _mousePos : Common::Point(_mousePos.x / 2, _mousePos.y));
+				curButton = checkButtonHit(_screenButtonList, _mousePos);
 
 			if (curButton)
 				_lastButtonHit = curButton;
diff --git a/engines/lab/interface.cpp b/engines/lab/interface.cpp
index 30f2f13fa55..41a9047ba9d 100644
--- a/engines/lab/interface.cpp
+++ b/engines/lab/interface.cpp
@@ -124,8 +124,6 @@ IntuiMessage *EventManager::getMsg() {
 		message._msgClass = (_leftClick) ? kMessageLeftClick : kMessageRightClick;
 		message._qualifier = 0;
 		message._mouse = _mousePos;
-		if (!_vm->_isHiRes)
-			message._mouse.x /= 2;
 		_leftClick = _rightClick = false;
 		return &message;
 	} else if (_keyPressed.keycode != Common::KEYCODE_INVALID) {
diff --git a/engines/lab/speciallocks.cpp b/engines/lab/speciallocks.cpp
index fe70b0f1118..6470e58641c 100644
--- a/engines/lab/speciallocks.cpp
+++ b/engines/lab/speciallocks.cpp
@@ -323,11 +323,7 @@ void SpecialLocks::changeCombination(uint16 number) {
 	byte *buffer = new byte[_numberImages[1]->_width * _numberImages[1]->_height * 2];
 
 	for (int i = 1; i <= (_numberImages[combnum]->_height / 2); i++) {
-		if (_vm->_isHiRes) {
-			if (i & 1)
-				_vm->waitTOF();
-		}
-		else
+		if (i & 1)
 			_vm->waitTOF();
 
 		display.setData(_vm->_graphics->getCurrentDrawingBuffer(), false);
diff --git a/engines/lab/utils.cpp b/engines/lab/utils.cpp
index a1409d231be..957e996c032 100644
--- a/engines/lab/utils.cpp
+++ b/engines/lab/utils.cpp
@@ -162,7 +162,7 @@ void Utils::verticalUnDiff(T *dest, Common::File *sourceFile, uint16 bytesPerRow
 
 				while (copy) {
 					if (bytesPerWord == 1)
-						*curPtr++ = sourceFile->readByte();
+						*curPtr = sourceFile->readByte();
 					else if (bytesPerWord == 2)
 						*curPtr = sourceFile->readUint16LE();
 					else if (bytesPerWord == 4)