diff --git a/games/devtest/mods/callbacks/items.lua b/games/devtest/mods/callbacks/items.lua
index acb05d505..83c52f2ac 100644
--- a/games/devtest/mods/callbacks/items.lua
+++ b/games/devtest/mods/callbacks/items.lua
@@ -6,6 +6,7 @@ minetest.register_craftitem("callbacks:callback_item_1", {
 	description = "Callback test item 1\n(Use/Drop + Sneak to switch to item 2)",
 	inventory_image = "callbacks_callback_item_1.png",
 	wield_image = "callbacks_callback_item_1.png",
+	groups = { callback_test = 1 },
 
 	on_secondary_use = function(itemstack, user, pointed_thing)
 		minetest.log("[callbacks:callback_item_1 on_secondary_use] " .. itemstack:get_name())
@@ -81,6 +82,7 @@ minetest.register_craftitem("callbacks:callback_item_2", {
 	description = "Callback test item 2\n(Use to switch to item 1)",
 	inventory_image = "callbacks_callback_item_2.png",
 	wield_image = "callbacks_callback_item_2.png",
+	groups = { callback_test = 1 },
 
 	on_use = function(itemstack, user, pointed_thing)
 		minetest.log("[callbacks:callback_item_2 on_use]")
diff --git a/games/devtest/mods/callbacks/nodes.lua b/games/devtest/mods/callbacks/nodes.lua
index baaf9fbc7..5cc9c8b70 100644
--- a/games/devtest/mods/callbacks/nodes.lua
+++ b/games/devtest/mods/callbacks/nodes.lua
@@ -7,7 +7,7 @@ minetest.register_node("callbacks:callback_node", {
 	description = "Callback Test Node (construct/destruct/timer)".."\n"..
 		"Tests callbacks: on_construct, after_place_node, on_destruct, after_destruct, after_dig_node, on_timer",
 	tiles = {"callbacks_callback_node.png"},
-	groups = {dig_immediate=3},
+	groups = {callback_test=1, dig_immediate=3},
 	-- This was known to cause a bug in minetest.item_place_node() when used
 	-- via minetest.place_node(), causing a placer with no position
 	paramtype2 = "facedir",
diff --git a/games/devtest/mods/testnodes/commands.lua b/games/devtest/mods/testnodes/commands.lua
index 9de506ae5..b04a2c16d 100644
--- a/games/devtest/mods/testnodes/commands.lua
+++ b/games/devtest/mods/testnodes/commands.lua
@@ -91,7 +91,7 @@ end
 
 minetest.register_chatcommand("test_place_nodes", {
 	params = "[ no_param2 ]",
-	description = "Test: Place all nodes and optionally their permissible param2 variants",
+	description = "Test: Place all nodes (except dummy and callback nodes) and optionally their permissible param2 variants",
 	func = function(name, param)
 		local player = minetest.get_player_by_name(name)
 		if not player then
@@ -113,7 +113,11 @@ minetest.register_chatcommand("test_place_nodes", {
 		local nodes = {}
 		local emerge_estimate = 0
 		for itemstring, def in pairs(minetest.registered_nodes) do
-			if itemstring ~= "ignore" then
+			if itemstring ~= "ignore" and
+					-- Skip callback test and dummy nodes
+					-- to avoid clutter and chat spam
+					minetest.get_item_group(itemstring, "callback_test") == 0 and
+					minetest.get_item_group(itemstring, "dummy") == 0 then
 				table.insert(nodes, itemstring)
 				if def.paramtype2 == 0 then
 					emerge_estimate = emerge_estimate + 1